RHSA-2020:5565 — Security Advisory
Red Hat Security Advisory: firefox security update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · December 16, 2020
Updated · November 22, 2025
Topic
An update for firefox is now available for Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.
This update upgrades Firefox to version 78.6.0 ESR.
Security Fix(es):
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chromium-browser: Uninitialized Use in V8 (CVE-2020-16042)
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Mozilla: Heap buffer overflow in WebGL (CVE-2020-26971)
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Mozilla: CSS Sanitizer performed incorrect sanitization (CVE-2020-26973)
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Mozilla: Incorrect cast of StyleGenericFlexBasis resulted in a heap use-after-free (CVE-2020-26974)
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Mozilla: Memory safety bugs fixed in Firefox 84 and Firefox ESR 78.6 (CVE-2020-35113)
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Mozilla: Internal network hosts could have been probed by a malicious webpage (CVE-2020-26978)
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Mozilla: The proxy.onRequest API did not catch view-source URLs (CVE-2020-35111)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.