When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy… (CVE-2026-8927)
When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.
AI Analysis
Technical Summary
The curl packages in Red Hat Enterprise Linux 10 provide the libcurl library and curl utility for file transfers over various protocols. CVE-2026-8927 is an information disclosure vulnerability caused by an uncleared proxy authentication state, which could potentially expose sensitive authentication information. Red Hat has released updated curl packages (version 8.12.1-4.el10_2.4) that fix this issue. The advisory covers multiple architectures and variants of Red Hat Enterprise Linux 10, including Extended Update Support and Extended Life Cycle versions. The vulnerability is classified under CWE-201 (Information Exposure).
Potential Impact
The vulnerability allows information disclosure due to the proxy authentication state not being cleared properly. This could lead to unauthorized access to sensitive authentication information in environments using proxy authentication with curl. The severity is rated as high by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated curl packages that address this vulnerability. Users should apply the provided security update for curl (version 8.12.1-4.el10_2.4) on Red Hat Enterprise Linux 10 systems to remediate the issue. Refer to the Red Hat advisory RHSA-2026:55432 and the update instructions at https://access.redhat.com/articles/11258 for detailed guidance. No additional mitigation is required beyond applying the official patch.
When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy… (CVE-2026-8927)
Description
When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.
CVSS v3.1
Score 9.1critical
Affected software
pkg:deb/ubuntu/curl?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/curl?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/curl?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/curl?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/curl?arch=source&distro=jammypkg:deb/ubuntu/curl?arch=source&distro=noblepkg:deb/ubuntu/curl?arch=source&distro=questingpkg:deb/ubuntu/curl?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The curl packages in Red Hat Enterprise Linux 10 provide the libcurl library and curl utility for file transfers over various protocols. CVE-2026-8927 is an information disclosure vulnerability caused by an uncleared proxy authentication state, which could potentially expose sensitive authentication information. Red Hat has released updated curl packages (version 8.12.1-4.el10_2.4) that fix this issue. The advisory covers multiple architectures and variants of Red Hat Enterprise Linux 10, including Extended Update Support and Extended Life Cycle versions. The vulnerability is classified under CWE-201 (Information Exposure).
Potential Impact
The vulnerability allows information disclosure due to the proxy authentication state not being cleared properly. This could lead to unauthorized access to sensitive authentication information in environments using proxy authentication with curl. The severity is rated as high by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated curl packages that address this vulnerability. Users should apply the provided security update for curl (version 8.12.1-4.el10_2.4) on Red Hat Enterprise Linux 10 systems to remediate the issue. Refer to the Red Hat advisory RHSA-2026:55432 and the update instructions at https://access.redhat.com/articles/11258 for detailed guidance. No additional mitigation is required beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-jr4f-4564-w3mr
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-8927"]
- Cvss Version
- 3.1
Threat ID: 6a483cb427e9c79719d81f5f
Added to database: 07/03/2026, 22:50:28 UTC
Last enriched: 08/17/2026, 21:34:15 UTC
Last updated: 10/02/2026, 14:46:12 UTC
Views: 91
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