libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client
cve CVE-2026-44950 2 sources, 2 claims · Watch
Red Hat writes:
libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client the claim
libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client the claim
- Severity they disagree
- CRITICAL NVDimportant Red Hat
- CVSS they disagree
- 9 NVD7.5 Red Hat
- Fixed in
- 2.0.3-150000.3.6.1, 2.0.7-160000.5.1, 2.0.3-3.6.1, 2.0.6-5.el10_2.3, 2.0.3-2.el8_10.3, 2.0.3-12.el9_8.3, 2.0.7-3.1 NVD
- Vendor
- SUSE NVD
- Product
- Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 NVD
- CWE
- CWE-122 NVDCWE-120 Red Hat
How far exploitation has got
- No public code known
- Proof of concept
- Proof of concept, verified
- A Metasploit module
- Exploited in the wild
- Used in ransomware campaigns
Why the CVSS differs
| Metric | NVD | Red Hat |
|---|---|---|
| Attack vector AV | network N | network N |
| Attack complexity AC | high H | high H |
| Privileges required PR | none N | none N |
| User interaction UI | none N | required R |
| Scope S | changed C | unchanged U |
| Confidentiality C | high H | high H |
| Integrity I | high H | high H |
| Availability A | high H | high H |
Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.
Timeline
| 2026-08-05 | first spoke of it: libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client | Red Hat |
| 2026-09-10 | first spoke of it: fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation. A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content. | NVD |
What it is to other things
In words only, so not counted until a person confirms one:
| affects | suse/container_suse_kiosk_tigervnc_x11vnc_1_14_63_8NVD says “SUSE · Container suse/kiosk/tigervnc-x11vnc:1.14-63.8” |
| made_by | suseNVD says “SUSE” |
Every value, with what each source said and its receipt
| Property | Source | Said | Means here | ||||
|---|---|---|---|---|---|---|---|
| Automatable automatable | NVD | no At least one of those steps needs a person. receipt
What the source handed over{
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]
}
} | — | ||||
| CVSS cvss conflict | NVD | 9receipt
What the source handed over{
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"lang": "en",
"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
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"scope": "CHANGED",
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},
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}
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{
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
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"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 9.5,
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"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
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"subConfidentialityImpact": "HIGH",
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"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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{
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],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-10T09:17:02.490",
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"source": "meissner@suse.de",
"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950"
}
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
} | — | ||||
| CVSS cvss conflict | Red Hat | 7.5receipt
What the source handed over{
"CVE": "CVE-2026-44950",
"CWE": "CWE-120",
"advisories": [
"RHSA-2026:55447",
"RHSA-2026:55446",
"RHSA-2026:62123",
"RHSA-2026:59311",
"RHSA-2026:62231",
"RHSA-2026:61995",
"RHSA-2026:59312",
"RHSA-2026:61390",
"RHSA-2026:61756",
"RHSA-2026:55448",
"RHSA-2026:61755"
],
"affected_packages": [
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],
"bugzilla": "2509622",
"bugzilla_description": "libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client",
"cvss3_score": "7.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-08-05T10:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-44950.json",
"severity": "important"
} | — | ||||
| Cvss4 cvss4 | NVD | 9.5receipt
What the source handed over{
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"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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]
}
} | — | ||||
| Cvss4 vector cvss4_vector | NVD | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xreceipt
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"source": "meissner@suse.de"
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
"id": "CVE-2026-44950",
"lastModified": "2026-09-10T19:17:27.730",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.0,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
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"Recovery": "NOT_DEFINED",
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"attackRequirements": "PRESENT",
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"availabilityRequirement": "NOT_DEFINED",
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"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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{
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{
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"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
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"vulnStatus": "Awaiting Analysis",
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"value": "CWE-122"
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"type": "Secondary"
}
]
}
} | — | ||||
| CVSS vector cvss_vector not compared | NVD | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Hreceipt
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"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
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"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
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"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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],
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"version": "2.0.3"
}
}
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},
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}
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}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
} | — | ||||
| CVSS vector cvss_vector not compared | Red Hat | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Hreceipt
What the source handed over{
"CVE": "CVE-2026-44950",
"CWE": "CWE-120",
"advisories": [
"RHSA-2026:55447",
"RHSA-2026:55446",
"RHSA-2026:62123",
"RHSA-2026:59311",
"RHSA-2026:62231",
"RHSA-2026:61995",
"RHSA-2026:59312",
"RHSA-2026:61390",
"RHSA-2026:61756",
"RHSA-2026:55448",
"RHSA-2026:61755"
],
"affected_packages": [
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"libXfont2-0:2.0.6-5.el10_0.2"
],
"bugzilla": "2509622",
"bugzilla_description": "libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client",
"cvss3_score": "7.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-08-05T10:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-44950.json",
"severity": "important"
} | — | ||||
| CWE cwe different words | NVD | CWE-122receipt
What the source handed over{
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},
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],
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
"id": "CVE-2026-44950",
"lastModified": "2026-09-10T19:17:27.730",
"metrics": {
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{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.0,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 6.0,
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 9.5,
"baseSeverity": "CRITICAL",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
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"options": [
{
"exploitation": "none"
},
{
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},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-10T09:17:02.490",
"references": [
{
"source": "meissner@suse.de",
"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950"
}
],
"sourceIdentifier": "meissner@suse.de",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-122"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
} | — | ||||
| CWE cwe different words | Red Hat | CWE-120receipt
What the source handed over{
"CVE": "CVE-2026-44950",
"CWE": "CWE-120",
"advisories": [
"RHSA-2026:55447",
"RHSA-2026:55446",
"RHSA-2026:62123",
"RHSA-2026:59311",
"RHSA-2026:62231",
"RHSA-2026:61995",
"RHSA-2026:59312",
"RHSA-2026:61390",
"RHSA-2026:61756",
"RHSA-2026:55448",
"RHSA-2026:61755"
],
"affected_packages": [
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"libXfont2-0:2.0.3-12.el9_8.3",
"libXfont2-0:2.0.3-12.el9_4.3",
"libXfont2-0:2.0.3-3.el7_9",
"libXfont2-0:2.0.3-2.el8_6.2",
"libXfont2-0:2.0.6-5.el10_2.3",
"libXfont2-0:2.0.3-2.el8_8.2",
"libXfont2-0:2.0.3-12.el9_2.3",
"libXfont2-0:2.0.3-2.el8_10.3",
"libXfont2-0:2.0.3-2.el8_4.2",
"libXfont2-0:2.0.6-5.el10_0.2"
],
"bugzilla": "2509622",
"bugzilla_description": "libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client",
"cvss3_score": "7.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-08-05T10:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-44950.json",
"severity": "important"
} | — | ||||
| Exploitation exploitation | NVD | none No evidence of exploitation, and no public proof of concept. receipt
What the source handed over{
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"lang": "en",
"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
"id": "CVE-2026-44950",
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"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
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"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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"role": "CISA Coordinator",
"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
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"published": "2026-09-10T09:17:02.490",
"references": [
{
"source": "meissner@suse.de",
"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950"
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"weaknesses": [
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{
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],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
} | — | ||||
| Fixed in fixed_in | NVD | 2.0.3-150000.3.6.1, 2.0.7-160000.5.1, 2.0.3-3.6.1, 2.0.6-5.el10_2.3, 2.0.3-2.el8_10.3, 2.0.3-12.el9_8.3, 2.0.7-3.1receipt
What the source handed over{
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"vendor": "SUSE",
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}
]
},
{
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}
]
},
{
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}
]
},
{
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}
]
},
{
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"packageName": "libXfont2-devel",
"product": "openSUSE Tumbleweed",
"vendor": "SUSE",
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}
]
},
{
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"packageName": "libXfont2-devel-32bit",
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"vendor": "SUSE",
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"status": "affected",
"version": "?",
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}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont",
"product": "libXfont",
"vendor": "libXfont",
"versions": [
{
"lessThanOrEqual": "2.0.8",
"status": "affected",
"version": "?",
"versionType": "custom"
}
]
}
],
"source": "meissner@suse.de"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
"id": "CVE-2026-44950",
"lastModified": "2026-09-10T19:17:27.730",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.0,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 6.0,
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 9.5,
"baseSeverity": "CRITICAL",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
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"options": [
{
"exploitation": "none"
},
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-10T09:17:02.490",
"references": [
{
"source": "meissner@suse.de",
"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950"
}
],
"sourceIdentifier": "meissner@suse.de",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-122"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
} | — | ||||
| Packages packages | Red Hat | libXfont2-0:2.0.3-12.el9_6.3, libXfont2-0:2.0.3-12.el9_8.3, libXfont2-0:2.0.3-12.el9_4.3, libXfont2-0:2.0.3-3.el7_9, libXfont2-0:2.0.3-2.el8_6.2, libXfont2-0:2.0.6-5.el10_2.3, libXfont2-0:2.0.3-2.el8_8.2, libXfont2-0:2.0.3-12.el9_2.3, libXfont2-0:2.0.3-2.el8_10.3, libXfont2-0:2.0.3-2.el8_4.2, libXfont2-0:2.0.6-5.el10_0.2receipt
What the source handed over{
"CVE": "CVE-2026-44950",
"CWE": "CWE-120",
"advisories": [
"RHSA-2026:55447",
"RHSA-2026:55446",
"RHSA-2026:62123",
"RHSA-2026:59311",
"RHSA-2026:62231",
"RHSA-2026:61995",
"RHSA-2026:59312",
"RHSA-2026:61390",
"RHSA-2026:61756",
"RHSA-2026:55448",
"RHSA-2026:61755"
],
"affected_packages": [
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"libXfont2-0:2.0.3-12.el9_8.3",
"libXfont2-0:2.0.3-12.el9_4.3",
"libXfont2-0:2.0.3-3.el7_9",
"libXfont2-0:2.0.3-2.el8_6.2",
"libXfont2-0:2.0.6-5.el10_2.3",
"libXfont2-0:2.0.3-2.el8_8.2",
"libXfont2-0:2.0.3-12.el9_2.3",
"libXfont2-0:2.0.3-2.el8_10.3",
"libXfont2-0:2.0.3-2.el8_4.2",
"libXfont2-0:2.0.6-5.el10_0.2"
],
"bugzilla": "2509622",
"bugzilla_description": "libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client",
"cvss3_score": "7.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-08-05T10:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-44950.json",
"severity": "important"
} | — | ||||
| Product product | NVD | Container suse/kiosk/tigervnc-x11vnc:1.14-63.8receipt
What the source handed over{
"cve": {
"affected": [
{
"affectedData": [
{
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"packageName": "libXfont2-2",
"product": "Container suse/kiosk/tigervnc-x11vnc:1.14-63.8",
"vendor": "SUSE",
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"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"packageName": "libXfont2-2",
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"vendor": "SUSE",
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{
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"status": "affected",
"version": "?",
"versionType": "custom"
}
]
},
{
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"product": "Image SLES15-SP6-SAP",
"vendor": "SUSE",
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"status": "affected",
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}
]
},
{
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"vendor": "SUSE",
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}
]
},
{
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},
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"source": "meissner@suse.de"
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
"id": "CVE-2026-44950",
"lastModified": "2026-09-10T19:17:27.730",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.0,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 6.0,
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 9.5,
"baseSeverity": "CRITICAL",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
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],
"ssvcV203": [
{
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{
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},
{
"technicalImpact": "total"
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],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-10T09:17:02.490",
"references": [
{
"source": "meissner@suse.de",
"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950"
}
],
"sourceIdentifier": "meissner@suse.de",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-122"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
} | — | ||||
| Severity severity conflict | NVD | CRITICAL From the CVSS base score at 9.0 and above. receipt
What the source handed over{
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"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
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"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
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"valueDensity": "NOT_DEFINED",
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{
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],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
}
}
]
},
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"references": [
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"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950"
}
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"type": "Secondary"
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]
}
} | critical | ||||
| Severity severity conflict | Red Hat | important A flaw that can easily compromise confidentiality, integrity or availability. receipt
What the source handed over{
"CVE": "CVE-2026-44950",
"CWE": "CWE-120",
"advisories": [
"RHSA-2026:55447",
"RHSA-2026:55446",
"RHSA-2026:62123",
"RHSA-2026:59311",
"RHSA-2026:62231",
"RHSA-2026:61995",
"RHSA-2026:59312",
"RHSA-2026:61390",
"RHSA-2026:61756",
"RHSA-2026:55448",
"RHSA-2026:61755"
],
"affected_packages": [
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"libXfont2-0:2.0.3-12.el9_4.3",
"libXfont2-0:2.0.3-3.el7_9",
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"libXfont2-0:2.0.6-5.el10_0.2"
],
"bugzilla": "2509622",
"bugzilla_description": "libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client",
"cvss3_score": "7.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-08-05T10:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-44950.json",
"severity": "important"
} | high | ||||
| Status status | NVD | Awaiting Analysisreceipt
What the source handed over{
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"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
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]
}
} | — | ||||
| Technical impact technical_impact | NVD | total The attacker gains full control of the component, or all of its information. receipt
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]
}
} | — | ||||
| Vendor vendor | NVD | SUSEreceipt
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],
"source": "meissner@suse.de"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.\n\nA malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content."
}
],
"id": "CVE-2026-44950",
"lastModified": "2026-09-10T19:17:27.730",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.0,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 6.0,
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 9.5,
"baseSeverity": "CRITICAL",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "meissner@suse.de",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-44950",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T17:19:50.287306Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-10T09:17:02.490",
"references": [
{
"source": "meissner@suse.de",
"url": "https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950"
}
],
"sourceIdentifier": "meissner@suse.de",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-122"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
} | — |
Every claim, by kind
vulnerability
| libxfont2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client zetlyn/cve-redhat · 2026-08-05 | cvss 7.5 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H cwe CWE-120 packages libXfont2-0:2.0.3-12.el9_6.3, libXfont2-0:2.0.3-12.el9_8.3, libXfont2-0:2.0.3-12.el9_4.3, libXfont2-0:2.0.3-3.el7_9, libXfont2-0:2.0.3-2.el8_6.2, libXfont2-0:2.0.6-5.el10_2.3, libXfont2-0:2.0.3-2.el8_8.2, libXfont2-0:2.0.3-12.el9_2.3, libXfont2-0:2.0.3-2.el8_10.3, libXfont2-0:2.0.3-2.el8_4.2, libXfont2-0:2.0.6-5.el10_0.2 severity important | source |
| fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation.
A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content. zetlyn/cve-nvd · 2026-09-10 | automatable no cvss 9 cvss4 9.5 cvss4_vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H cwe CWE-122 exploitation none fixed_in 2.0.3-150000.3.6.1, 2.0.7-160000.5.1, 2.0.3-3.6.1, 2.0.6-5.el10_2.3, 2.0.3-2.el8_10.3, 2.0.3-12.el9_8.3, 2.0.7-3.1 product Container suse/kiosk/tigervnc-x11vnc:1.14-63.8 severity CRITICAL status Awaiting Analysis technical_impact total vendor SUSE | source |