High [CVE-2026-8927] Information disclosure due to uncleared proxy authentication state
This high-severity Red Hat Linux advisory covers CVE-2026-8927 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Hardened Images.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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`. A flaw was found in libcurl.
This oversight can lead to the unintended disclosure of `Proxy-Authorization` headers to an incorrect proxy, potentially exposing sensitive authentication information to an unauthorized entity. This flaw leads only to a confidentiality impact.
There has been no observed integrity impact. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-201. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Confidential Compute Attestation; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift Container Platform 4; Red Hat OpenShift Dev Spaces.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Trusted Profile Analyzer as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- curl-0:8.12.1-4.el10_2.4
- curl-0:7.76.1-40.el9_8.7
- curl-main-8.21.0-0.1.hum1
- rust-main-1.96.1-1.hum1
- RHSA-2026:55432
- RHSA-2026:69126
- RHSA-2026:29017
- RHSA-2026:34975
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- To mitigate this issue, applications utilizing libcurl should avoid reusing handles when switching between different proxy configurations. This operational control prevents the unintended leakage of `Proxy-Authorization` headers to incorrect proxies.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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