RHSA-2026:55439HighCVSS 8.1

Red Hat Security Advisory: curl security update

Published
August 17, 2026
Last Modified
August 17, 2026

🔗 CVE IDs covered (4)

CVE-2026-3783 →CVE-2026-8286 →CVE-2026-9547 →CVE-2026-1965 →

📋 Description

CVE-2026-1965 — curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication CVE-2026-3783 — curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect CVE-2026-8286 — curl: curl: Insecure connection establishment due to TLS configuration mismatch CVE-2026-9547 — curl: curl: Man-in-the-middle attack via SSH host key bypass

🎯 Affected products76

  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-0:7.76.1-40.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-0:7.76.1-40.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-0:7.76.1-40.el9_8.5.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-0:7.76.1-40.el9_8.5.src as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-0:7.76.1-40.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debuginfo-0:7.76.1-40.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • curl-debugsource-0:7.76.1-40.el9_8.5.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-minimal-0:7.76.1-40.el9_8.5.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-minimal-0:7.76.1-40.el9_8.5.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • curl-minimal-0:7.76.1-40.el9_8.5.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • +46 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: To prevent the leakage of OAuth2 bearer tokens, ensure that `.netrc` files are carefully managed. Avoid configuring `.netrc` entries for untrusted or unknown hostnames, particularly when `curl` is used with OAuth2 bearer tokens and is configured to follow redirects. Regularly review and restrict the scope of credentials stored in `.netrc` files to only explicitly trusted destinations. 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.

🔗 References (7)