curl: libcurl: Credential leak via reused proxy connection during HTTP redirects
cve CVE-2026-6429 2 sources, 2 claims · Watch
Red Hat writes:
curl: libcurl: Credential leak via reused proxy connection during HTTP redirects the claim
curl: libcurl: Credential leak via reused proxy connection during HTTP redirects the claim
- Severity
- MEDIUM NVDmoderate Red Hat
- CVSS they disagree
- 5.3 NVD6.5 Red Hat
- Fixed in
- 8.14.2, 8.16.1, 8.20.0 NVD
- Vendor
- curl NVD
- Product
- curl NVD
- CWE
- CWE-200 NVDCWE-201 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 | low L |
| Privileges required PR | low L | none N |
| User interaction UI | none N | required R |
| Scope S | unchanged U | unchanged U |
| Confidentiality C | high H | high H |
| Integrity I | none N | none N |
| 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
| 2026-04-29 | first spoke of it: curl: libcurl: Credential leak via reused proxy connection during HTTP redirects | Red Hat |
| 2026-05-13 | first spoke of it: When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances. | NVD |
What it is to other things
| affects | haxx/curl NVD |
| made_by | haxx NVD |
In words only, so not counted until a person confirms one:
| made_by | curlNVD says “curl” |
| affects | curl/curlNVD says “curl · curl” |
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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"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "92C0C270-A4E4-4DF0-96F1-833497B9CBDF",
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances."
}
],
"id": "CVE-2026-6429",
"lastModified": "2026-09-15T07:16:29.557",
"metrics": {
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{
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"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
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}
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T14:03:52.312824Z",
"version": "2.0.3"
}
}
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"published": "2026-05-13T13:01:56.930",
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"tags": [
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"url": "https://curl.se/docs/CVE-2026-6429.html"
},
{
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{
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{
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"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
} | — | ||||
| CVSS cvss conflict | NVD | 5.3receipt
What the source handed over{
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"value": "When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances."
}
],
"id": "CVE-2026-6429",
"lastModified": "2026-09-15T07:16:29.557",
"metrics": {
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{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
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},
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T14:03:52.312824Z",
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}
}
]
},
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"references": [
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"tags": [
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},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
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"url": "https://curl.se/docs/CVE-2026-6429.json"
},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
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}
],
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{
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"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
} | — | ||||
| CVSS cvss conflict | Red Hat | 6.5receipt
What the source handed over{
"CVE": "CVE-2026-6429",
"CWE": "CWE-201",
"advisories": [
"RHSA-2026:12916"
],
"affected_packages": [
"curl-main-8.20.0-0.1.hum1"
],
"bugzilla": "2461205",
"bugzilla_description": "curl: libcurl: Credential leak via reused proxy connection during HTTP redirects",
"cvss3_score": "6.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-04-29T00:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-6429.json",
"severity": "moderate"
} | — | ||||
| CVSS vector cvss_vector not compared | NVD | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Nreceipt
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} | — | ||||
| CVSS vector cvss_vector not compared | Red Hat | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:Nreceipt
What the source handed over{
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"severity": "moderate"
} | — | ||||
| CWE cwe different words | NVD | CWE-200receipt
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]
}
} | — | ||||
| CWE cwe different words | Red Hat | CWE-201receipt
What the source handed over{
"CVE": "CVE-2026-6429",
"CWE": "CWE-201",
"advisories": [
"RHSA-2026:12916"
],
"affected_packages": [
"curl-main-8.20.0-0.1.hum1"
],
"bugzilla": "2461205",
"bugzilla_description": "curl: libcurl: Credential leak via reused proxy connection during HTTP redirects",
"cvss3_score": "6.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-04-29T00:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-6429.json",
"severity": "moderate"
} | — | ||||
| 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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{
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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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{
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{
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]
}
],
"source": "2499f714-1537-4658-8207-48ae4bb9eae9"
}
],
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}
],
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]
}
],
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{
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"value": "When asked to both use a `.netrc` file for credentials and to follow HTTP\nredirects, libcurl could leak the password used for the first host to the\nfollowed-to host under certain circumstances."
}
],
"id": "CVE-2026-6429",
"lastModified": "2026-09-15T07:16:29.557",
"metrics": {
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{
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"attackVector": "NETWORK",
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"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
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{
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{
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],
"role": "CISA Coordinator",
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"version": "2.0.3"
}
}
]
},
"published": "2026-05-13T13:01:56.930",
"references": [
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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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}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
} | — | ||||
| Fixed in fixed_in | NVD | 8.14.2, 8.16.1, 8.20.0receipt
What the source handed over{
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},
{
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{
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],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
} | — | ||||
| Packages packages | Red Hat | curl-main-8.20.0-0.1.hum1receipt
What the source handed over{
"CVE": "CVE-2026-6429",
"CWE": "CWE-201",
"advisories": [
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],
"affected_packages": [
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"bugzilla": "2461205",
"bugzilla_description": "curl: libcurl: Credential leak via reused proxy connection during HTTP redirects",
"cvss3_score": "6.5",
"cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"cvss_score": null,
"cvss_scoring_vector": null,
"package_state": null,
"public_date": "2026-04-29T00:00:00Z",
"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-6429.json",
"severity": "moderate"
} | — | ||||
| Product product | NVD | curlreceipt
What the source handed over{
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| Severity severity | NVD | MEDIUM From 4.0 to 6.9. receipt
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} | medium | ||||
| Severity severity | Red Hat | moderate A flaw that is harder to exploit, or whose impact is limited. receipt
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"resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-6429.json",
"severity": "moderate"
} | medium | ||||
| Status status | NVD | Modifiedreceipt
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}
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"metrics": {
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"confidentialityImpact": "HIGH",
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"scope": "UNCHANGED",
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},
{
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},
{
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"tags": [
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}
],
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],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
} | — | ||||
| Technical impact technical_impact | NVD | partial The attacker gains limited control, or limited information. receipt
What the source handed over{
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} | — | ||||
| Vendor vendor | NVD | curlreceipt
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],
"role": "CISA Coordinator",
"timestamp": "2026-05-13T14:03:52.312824Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-13T13:01:56.930",
"references": [
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://curl.se/docs/CVE-2026-6429.html"
},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
"Product"
],
"url": "https://curl.se/docs/CVE-2026-6429.json"
},
{
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"tags": [
"Exploit",
"Issue Tracking",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/3677759"
}
],
"sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-200"
}
],
"source": "2499f714-1537-4658-8207-48ae4bb9eae9",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
} | — |
Every claim, by kind
vulnerability
| curl: libcurl: Credential leak via reused proxy connection during HTTP redirects zetlyn/cve-redhat · 2026-04-29 | cvss 6.5 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N cwe CWE-201 packages curl-main-8.20.0-0.1.hum1 severity moderate | source |
| When asked to both use a `.netrc` file for credentials and to follow HTTP
redirects, libcurl could leak the password used for the first host to the
followed-to host under certain circumstances. zetlyn/cve-nvd · 2026-05-13 | automatable no cvss 5.3 cvss_vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N cwe CWE-200 exploitation none fixed_in 8.14.2, 8.16.1, 8.20.0 product curl severity MEDIUM status Modified technical_impact partial vendor curl | source |