RHSA-2020:5561HighCVSS 8.8

Red Hat Security Advisory: firefox security update

Published
December 16, 2020
Last Modified
November 12, 2026

🔗 CVE IDs covered (7)

CVE-2020-26978 →CVE-2020-35111 →CVE-2020-35113 →CVE-2020-16042 →CVE-2020-26971 →CVE-2020-26973 →CVE-2020-26974 →

📋 Description

CVE-2020-16042 — chromium-browser: Uninitialized Use in V8 CVE-2020-26971 — Mozilla: Heap buffer overflow in WebGL CVE-2020-26973 — Mozilla: CSS Sanitizer performed incorrect sanitization CVE-2020-26974 — Mozilla: Incorrect cast of StyleGenericFlexBasis resulted in a heap use-after-free CVE-2020-26978 — Mozilla: Internal network hosts could have been probed by a malicious webpage CVE-2020-35111 — Mozilla: The proxy.onRequest API did not catch view-source URLs CVE-2020-35113 — Mozilla: Memory safety bugs fixed in Firefox 84 and Firefox ESR 78.6

🎯 Affected products24

  • Red Hat Enterprise Linux Client (v. 7)
  • Red Hat Enterprise Linux Client Optional (v. 7)
  • Red Hat Enterprise Linux Server (v. 7)
  • Red Hat Enterprise Linux Server Optional (v. 7)
  • Red Hat Enterprise Linux Workstation (v. 7)
  • Red Hat Enterprise Linux Workstation Optional (v. 7)
  • firefox-0:78.6.0-1.el7_9.i686 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
  • firefox-0:78.6.0-1.el7_9.i686 as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • firefox-0:78.6.0-1.el7_9.i686 as a component of Red Hat Enterprise Linux Workstation Optional (v. 7)
  • firefox-0:78.6.0-1.el7_9.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-0:78.6.0-1.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-0:78.6.0-1.el7_9.s390x as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-0:78.6.0-1.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7)
  • firefox-0:78.6.0-1.el7_9.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-0:78.6.0-1.el7_9.src as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • firefox-0:78.6.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)
  • firefox-0:78.6.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-0:78.6.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • firefox-debuginfo-0:78.6.0-1.el7_9.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-debuginfo-0:78.6.0-1.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-debuginfo-0:78.6.0-1.el7_9.s390x as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-debuginfo-0:78.6.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)
  • firefox-debuginfo-0:78.6.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • firefox-debuginfo-0:78.6.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)

✅ 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 After installing the update, Firefox must be restarted for the changes to take effect.

🔗 References (10)