RHSA-2026:99643LowCVSS 3.7

Red Hat Security Advisory: curl security update

Published
November 12, 2026
Last Modified
November 12, 2026

🔗 CVE IDs covered (1)

CVE-2026-6276 →

📋 Description

CVE-2026-6276 — curl: libcurl: Information disclosure due to cookie leak when reusing connections with custom Host headers

🎯 Affected products51

  • Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-0:8.12.1-4.el10_2.9.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-0:8.12.1-4.el10_2.9.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-0:8.12.1-4.el10_2.9.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-0:8.12.1-4.el10_2.9.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debuginfo-0:8.12.1-4.el10_2.9.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • curl-debugsource-0:8.12.1-4.el10_2.9.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • libcurl-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • libcurl-0:8.12.1-4.el10_2.9.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • libcurl-0:8.12.1-4.el10_2.9.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • libcurl-0:8.12.1-4.el10_2.9.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • libcurl-debuginfo-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • libcurl-debuginfo-0:8.12.1-4.el10_2.9.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.10.2)
  • libcurl-debuginfo-0:8.12.1-4.el10_2.9.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.10.2)
  • +21 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: To mitigate this issue, avoid using custom `Host:` headers with libcurl, especially when reusing the same easy handle for multiple requests. This vulnerability primarily arises from specific debugging configurations.

🔗 References (4)