High severity8.8NVD Advisory· Published Dec 9, 2020· Updated Jun 17, 2026
CVE-2020-26959
CVE-2020-26959
Description
During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
35<83+ 2 more
- (no CPE)range: <83
- (no CPE)range: < 83
- (no CPE)range: < 78.5
<78.5+ 1 more
- (no CPE)range: <78.5
- (no CPE)range: < 78.5
- osv-coords30 versionspkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%205pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP1pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2
< 128.5.1-1.1+ 29 more
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 78.5.0-lp151.2.79.1
- (no CPE)range: < 78.5.0-lp152.2.30.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.5.0-lp151.2.59.1
- (no CPE)range: < 78.5.0-lp152.2.19.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-3.119.1
- (no CPE)range: < 78.5.0-8.17.1
- (no CPE)range: < 78.5.0-78.105.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-112.36.1
- (no CPE)range: < 78.5.0-3.107.1
- (no CPE)range: < 78.5.0-3.107.1
Patches
Vulnerability mechanics
References
4- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-50/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-51/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-52/nvdVendor Advisory
News mentions
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