RHSA-2026:92368HighCVSS 8.1

Red Hat Security Advisory: curl security, bug fix, and enhancement update

Published
October 29, 2026
Last Modified
November 2, 2026

🔗 CVE IDs covered (5)

CVE-2026-11856 →CVE-2026-8458 →CVE-2026-8924 →CVE-2026-8927 →CVE-2026-8932 →

📋 Description

CVE-2026-8458 — curl: libcurl: Unauthorized connection reuse due to a logical error CVE-2026-8924 — curl: curl: Cookie injection via malicious HTTP server using super cookies CVE-2026-8927 — curl: Information disclosure due to uncleared proxy authentication state CVE-2026-8932 — libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse CVE-2026-11856 — curl: curl: Information disclosure via incorrect Digest authentication header reuse

🎯 Affected products46

  • Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-0:7.61.1-34.el8_10.18.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-0:7.61.1-34.el8_10.18.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-0:7.61.1-34.el8_10.18.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-0:7.61.1-34.el8_10.18.src as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-0:7.61.1-34.el8_10.18.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debuginfo-0:7.61.1-34.el8_10.18.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debuginfo-0:7.61.1-34.el8_10.18.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debuginfo-0:7.61.1-34.el8_10.18.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debuginfo-0:7.61.1-34.el8_10.18.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debuginfo-0:7.61.1-34.el8_10.18.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debugsource-0:7.61.1-34.el8_10.18.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debugsource-0:7.61.1-34.el8_10.18.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debugsource-0:7.61.1-34.el8_10.18.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debugsource-0:7.61.1-34.el8_10.18.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-debugsource-0:7.61.1-34.el8_10.18.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-minimal-debuginfo-0:7.61.1-34.el8_10.18.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-minimal-debuginfo-0:7.61.1-34.el8_10.18.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-minimal-debuginfo-0:7.61.1-34.el8_10.18.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-minimal-debuginfo-0:7.61.1-34.el8_10.18.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • curl-minimal-debuginfo-0:7.61.1-34.el8_10.18.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-0:7.61.1-34.el8_10.18.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-0:7.61.1-34.el8_10.18.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-0:7.61.1-34.el8_10.18.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-0:7.61.1-34.el8_10.18.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-0:7.61.1-34.el8_10.18.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-debuginfo-0:7.61.1-34.el8_10.18.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-debuginfo-0:7.61.1-34.el8_10.18.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-debuginfo-0:7.61.1-34.el8_10.18.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • libcurl-debuginfo-0:7.61.1-34.el8_10.18.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • +16 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Workaround: Do not use trailing-dot hostnames in URLs passed to curl. Trailing dots are uncommon and incompatible with TLS SNI. Upgrade to curl 8.21.0 to resolve Workaround: 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. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Correct usage of the library: Create a fresh handle for a different origin, or explicitly clear authentication-related state before reuse: ```c // req.A curl = curl_easy_init(); ... curl_easy_cleanup(curl); // req.B curl = curl_easy_init(); ... curl_easy_cleanup(curl); ``` Fixed in libcurl 8.21.0; affected range: 7.10.6 – 8.20.0

🔗 References (9)