RHSA-2026:96078HighCVSS 7.7

Red Hat Security Advisory: squid:4 security update

Published
November 9, 2026
Last Modified
November 9, 2026

🔗 CVE IDs covered (1)

CVE-2026-61642 →

📋 Description

CVE-2026-61642 — squid: squid: Request Smuggling in HTTP Transfer-Encoding

🎯 Affected products31

  • Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-0:1.0.1-2.module+el8.9.0+19703+a1da7223.src (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debuginfo-0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debuginfo-0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debuginfo-0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debuginfo-0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debugsource-0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debugsource-0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debugsource-0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-debugsource-0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-devel-0:1.0.1-2.module+el8.9.0+19703+a1da7223.aarch64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-devel-0:1.0.1-2.module+el8.9.0+19703+a1da7223.ppc64le (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-devel-0:1.0.1-2.module+el8.9.0+19703+a1da7223.s390x (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • libecap-devel-0:1.0.1-2.module+el8.9.0+19703+a1da7223.x86_64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-7:4.15-10.module+el8.10.0+25179+3c013c36.13.aarch64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-7:4.15-10.module+el8.10.0+25179+3c013c36.13.ppc64le (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-7:4.15-10.module+el8.10.0+25179+3c013c36.13.s390x (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-7:4.15-10.module+el8.10.0+25179+3c013c36.13.src (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-7:4.15-10.module+el8.10.0+25179+3c013c36.13.x86_64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-debuginfo-7:4.15-10.module+el8.10.0+25179+3c013c36.13.aarch64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-debuginfo-7:4.15-10.module+el8.10.0+25179+3c013c36.13.ppc64le (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-debuginfo-7:4.15-10.module+el8.10.0+25179+3c013c36.13.s390x (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-debuginfo-7:4.15-10.module+el8.10.0+25179+3c013c36.13.x86_64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-debugsource-7:4.15-10.module+el8.10.0+25179+3c013c36.13.aarch64 (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-debugsource-7:4.15-10.module+el8.10.0+25179+3c013c36.13.ppc64le (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • squid-debugsource-7:4.15-10.module+el8.10.0+25179+3c013c36.13.s390x (squid:4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • +1 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 vulnerability, administrators should enforce rigorous server-side HTTP header validation by explicitly denying conflicting or ambiguous framing requests. In your squid.conf, this can be temporarily achieved by rejecting the problematic encoding outright using the directive request_header_access Transfer-Encoding deny all. Alternatively, administrators can neutralize the request smuggling attack vector entirely by disabling connection reuse with the settings client_persistent_connections off and server_persistent_connections off.

🔗 References (4)