samba: group policy certificate enrollment uses http:// without validation
cve CVE-2026-3012 2 sources, 2 claims · Watch
- Severity they disagree
- MEDIUM NVDimportant Red Hat
- CVSS they disagree
- 6.8 NVD8 Red Hat
- Vendor
- Red Hat NVD
- Product
- Red Hat Enterprise Linux 10 NVD
- CWE
- CWE-345 NVDCWE-345 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 | adjacent A | adjacent A |
| Attack complexity AC | high H | high H |
| Privileges required PR | none N | none N |
| User interaction UI | none N | none N |
| Scope S | unchanged U | changed C |
| Confidentiality C | high H | high H |
| Integrity I | high H | high H |
| Availability A | none N | none N |
Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.
Timeline
| 2026-05-27 | first spoke of it: A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications. | NVD |
| 2026-05-27 | first spoke of it: samba: group policy certificate enrollment uses http:// without validation | Red Hat |
What it is to other things
| affects | redhat/enterprise_linux NVD |
| affects | redhat/openshift_container_platform NVD |
| affects | samba/samba NVD |
| made_by | redhat NVD |
| made_by | samba NVD |
In words only, so not counted until a person confirms one:
| made_by | red_hatNVD says “Red Hat” |
| affects | red_hat/red_hat_enterprise_linux_10NVD says “Red Hat · Red Hat Enterprise Linux 10” |
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 | 6.8receipt
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} | — | ||||
| CVSS cvss conflict | Red Hat | 8receipt
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"severity": "important"
} | — | ||||
| CVSS vector cvss_vector not compared | NVD | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nreceipt
What the source handed over{
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{
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} | — | ||||
| CVSS vector cvss_vector not compared | Red Hat | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Nreceipt
What the source handed over{
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"CWE": "CWE-345",
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"cvss_score": null,
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"package_state": null,
"public_date": "2026-05-27T09:17:49Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-3012.json",
"severity": "important"
} | — | ||||
| CWE cwe | NVD | CWE-345receipt
What the source handed over{
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{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-27T00:00:00+00:00",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-27T11:16:18.357",
"references": [
{
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{
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{
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{
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{
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{
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{
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{
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{
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"tags": [
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{
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{
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{
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{
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{
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{
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{
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{
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"tags": [
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},
{
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"tags": [
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"Third Party Advisory"
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},
{
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"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3012.json"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
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"value": "CWE-345"
}
],
"source": "secalert@redhat.com",
"type": "Secondary"
},
{
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{
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"value": "CWE-345"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
}
} | — | ||||
| CWE cwe | Red Hat | CWE-345receipt
What the source handed over{
"CVE": "CVE-2026-3012",
"CWE": "CWE-345",
"advisories": [
"RHSA-2026:29863",
"RHSA-2026:28057",
"RHSA-2026:62409",
"RHSA-2026:56853",
"RHSA-2026:56786",
"RHSA-2026:28055",
"RHSA-2026:65907",
"RHSA-2026:28056",
"RHSA-2026:28053",
"RHSA-2026:28054",
"RHSA-2026:59831",
"RHSA-2026:70586",
"RHSA-2026:56911",
"RHSA-2026:65851",
"RHSA-2026:25979",
"RHSA-2026:57483",
"RHSA-2026:65839",
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"RHSA-2026:22644",
"RHSA-2026:62549",
"RHSA-2026:60019",
"RHSA-2026:25049",
"RHSA-2026:67857"
],
"affected_packages": [
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"rhcos-415.92.202608180329-0",
"rhcos-413.92.202609080414-0",
"samba-0:4.19.4-16.el8_10",
"rhcos-412.86.202608241157-0",
"rhcos-417.94.202608250221-0",
"rhcos-418.94.202609031320-0",
"samba-0:4.23.5-10.el9_8",
"rhcos-417.94.202609191027-0",
"samba-0:4.21.3-114.el10_0.1",
"samba-0:4.15.5-16.el8_6.1",
"rhcos-412.86.202609082051-0",
"samba-0:4.23.5-109.el10_2",
"rhcos-418.94.202608142238-0",
"rhcos-416.94.202609011112-0",
"samba-0:4.17.5-7.el8_8.1",
"rhcos-414.92.202609011250-0",
"rhcos-415.92.202609140326-0",
"samba-0:4.21.3-14.el9_6.1",
"samba-0:4.19.4-105.el9_4.4",
"rhcos-4.19.9.6.202606241344-0",
"samba-0:4.17.5-105.el9_2.5",
"rhcos-414.92.202608172040-0"
],
"bugzilla": "2447319",
"bugzilla_description": "samba: group policy certificate enrollment uses http:// without validation",
"cvss3_score": "8.0",
"cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-05-27T09:17:49Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-3012.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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{
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},
{
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{
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},
{
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],
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]
},
{
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},
{
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]
},
{
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]
},
{
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"cpe:/o:redhat:rhel_tus:8.8::baseos"
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]
},
{
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"cpe:/a:redhat:enterprise_linux:9::crb",
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"cpe:/o:redhat:enterprise_linux:9::baseos"
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}
]
},
{
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"cpes": [
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"cpe:/a:redhat:enterprise_linux:9::crb",
"cpe:/a:redhat:enterprise_linux:9::resilientstorage",
"cpe:/o:redhat:enterprise_linux:9::baseos"
],
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}
]
},
{
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]
},
{
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]
},
{
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"cpe:/o:redhat:rhel_eus:9.6::baseos"
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]
},
{
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],
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}
]
},
{
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],
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]
},
{
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]
},
{
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]
},
{
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"versions": [
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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],
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"type": "Secondary"
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"type": "Secondary"
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}
} | — | ||||
| Packages packages | Red Hat | rhcos-416.94.202608150307-0, rhcos-415.92.202608180329-0, rhcos-413.92.202609080414-0, samba-0:4.19.4-16.el8_10, rhcos-412.86.202608241157-0, rhcos-417.94.202608250221-0, rhcos-418.94.202609031320-0, samba-0:4.23.5-10.el9_8, rhcos-417.94.202609191027-0, samba-0:4.21.3-114.el10_0.1, samba-0:4.15.5-16.el8_6.1, rhcos-412.86.202609082051-0, samba-0:4.23.5-109.el10_2, rhcos-418.94.202608142238-0, rhcos-416.94.202609011112-0, samba-0:4.17.5-7.el8_8.1, rhcos-414.92.202609011250-0, rhcos-415.92.202609140326-0, samba-0:4.21.3-14.el9_6.1, samba-0:4.19.4-105.el9_4.4, rhcos-4.19.9.6.202606241344-0, samba-0:4.17.5-105.el9_2.5, rhcos-414.92.202608172040-0receipt
What the source handed over{
"CVE": "CVE-2026-3012",
"CWE": "CWE-345",
"advisories": [
"RHSA-2026:29863",
"RHSA-2026:28057",
"RHSA-2026:62409",
"RHSA-2026:56853",
"RHSA-2026:56786",
"RHSA-2026:28055",
"RHSA-2026:65907",
"RHSA-2026:28056",
"RHSA-2026:28053",
"RHSA-2026:28054",
"RHSA-2026:59831",
"RHSA-2026:70586",
"RHSA-2026:56911",
"RHSA-2026:65851",
"RHSA-2026:25979",
"RHSA-2026:57483",
"RHSA-2026:65839",
"RHSA-2026:22963",
"RHSA-2026:22644",
"RHSA-2026:62549",
"RHSA-2026:60019",
"RHSA-2026:25049",
"RHSA-2026:67857"
],
"affected_packages": [
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"rhcos-415.92.202608180329-0",
"rhcos-413.92.202609080414-0",
"samba-0:4.19.4-16.el8_10",
"rhcos-412.86.202608241157-0",
"rhcos-417.94.202608250221-0",
"rhcos-418.94.202609031320-0",
"samba-0:4.23.5-10.el9_8",
"rhcos-417.94.202609191027-0",
"samba-0:4.21.3-114.el10_0.1",
"samba-0:4.15.5-16.el8_6.1",
"rhcos-412.86.202609082051-0",
"samba-0:4.23.5-109.el10_2",
"rhcos-418.94.202608142238-0",
"rhcos-416.94.202609011112-0",
"samba-0:4.17.5-7.el8_8.1",
"rhcos-414.92.202609011250-0",
"rhcos-415.92.202609140326-0",
"samba-0:4.21.3-14.el9_6.1",
"samba-0:4.19.4-105.el9_4.4",
"rhcos-4.19.9.6.202606241344-0",
"samba-0:4.17.5-105.el9_2.5",
"rhcos-414.92.202608172040-0"
],
"bugzilla": "2447319",
"bugzilla_description": "samba: group policy certificate enrollment uses http:// without validation",
"cvss3_score": "8.0",
"cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-05-27T09:17:49Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-3012.json",
"severity": "important"
} | — | ||||
| Product product | NVD | Red Hat Enterprise Linux 10receipt
What the source handed over{
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}
]
},
{
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],
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{
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]
},
{
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]
},
{
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],
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},
{
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{
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"defaultStatus": "affected",
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},
{
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{
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{
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{
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} | — | ||||
| Severity severity conflict | NVD | MEDIUM From 4.0 to 6.9. receipt
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"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-345"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
}
} | medium | ||||
| Severity severity conflict | Red Hat | important A flaw that can easily compromise confidentiality, integrity or availability. receipt
What the source handed over{
"CVE": "CVE-2026-3012",
"CWE": "CWE-345",
"advisories": [
"RHSA-2026:29863",
"RHSA-2026:28057",
"RHSA-2026:62409",
"RHSA-2026:56853",
"RHSA-2026:56786",
"RHSA-2026:28055",
"RHSA-2026:65907",
"RHSA-2026:28056",
"RHSA-2026:28053",
"RHSA-2026:28054",
"RHSA-2026:59831",
"RHSA-2026:70586",
"RHSA-2026:56911",
"RHSA-2026:65851",
"RHSA-2026:25979",
"RHSA-2026:57483",
"RHSA-2026:65839",
"RHSA-2026:22963",
"RHSA-2026:22644",
"RHSA-2026:62549",
"RHSA-2026:60019",
"RHSA-2026:25049",
"RHSA-2026:67857"
],
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"rhcos-415.92.202608180329-0",
"rhcos-413.92.202609080414-0",
"samba-0:4.19.4-16.el8_10",
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"rhcos-418.94.202608142238-0",
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"samba-0:4.21.3-14.el9_6.1",
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"samba-0:4.17.5-105.el9_2.5",
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],
"bugzilla": "2447319",
"bugzilla_description": "samba: group policy certificate enrollment uses http:// without validation",
"cvss3_score": "8.0",
"cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-05-27T09:17:49Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-3012.json",
"severity": "important"
} | high | ||||
| Status status | NVD | Modifiedreceipt
What the source handed over{
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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 | Red Hatreceipt
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} | — |
Every claim, by kind
vulnerability
| samba: group policy certificate enrollment uses http:// without validation zetlyn/cve-redhat · 2026-05-27 | cvss 8 cvss_vector CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N cwe CWE-345 packages rhcos-416.94.202608150307-0, rhcos-415.92.202608180329-0, rhcos-413.92.202609080414-0, samba-0:4.19.4-16.el8_10, rhcos-412.86.202608241157-0, rhcos-417.94.202608250221-0, rhcos-418.94.202609031320-0, samba-0:4.23.5-10.el9_8, rhcos-417.94.202609191027-0, samba-0:4.21.3-114.el10_0.1, samba-0:4.15.5-16.el8_6.1, rhcos-412.86.202609082051-0, samba-0:4.23.5-109.el10_2, rhcos-418.94.202608142238-0, rhcos-416.94.202609011112-0, samba-0:4.17.5-7.el8_8.1, rhcos-414.92.202609011250-0, rhcos-415.92.202609140326-0, samba-0:4.21.3-14.el9_6.1, samba-0:4.19.4-105.el9_4.4, rhcos-4.19.9.6.202606241344-0, samba-0:4.17.5-105.el9_2.5, rhcos-414.92.202608172040-0 severity important | source |
| A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications. zetlyn/cve-nvd · 2026-05-27 | automatable no cvss 6.8 cvss_vector CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N cwe CWE-345 exploitation none product Red Hat Enterprise Linux 10 severity MEDIUM status Modified technical_impact total vendor Red Hat | source |