High severity8.1NVD Advisory· Published May 27, 2025· Updated Apr 13, 2026

CVE-2025-5269

Description

Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.11 and Thunderbird 128.11.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Mozilla Corporation/Firefox2 versions
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <128.11.0
- (no CPE)range: <128.11
Mozilla Corporation/Thunderbird2 versions
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <128.11.0
- (no CPE)range: <128.11
osv-coords31 versions
pkg:rpm/almalinux/firefox pkg:rpm/almalinux/firefox-x11 pkg:rpm/almalinux/thunderbird pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/mozjs128&distro=openSUSE%20Leap%2016.0 pkg:rpm/opensuse/mozjs128&distro=openSUSE%20Tumbleweed pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%207.1 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP3-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-ESPOS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP4-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-ESPOS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP5-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP6 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP7 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP3-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP4-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP5-LTSS pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP3 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP4 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP5 pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5 pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP6 pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7 pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6 pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7 pkg:rpm/suse/mozjs128&distro=SUSE%20Linux%20Enterprise%20Server%2016.0 pkg:rpm/suse/mozjs128&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0
< 128.11.0-1.el9_6.alma.1+ 30 more
- (no CPE)range: < 128.11.0-1.el9_6.alma.1
- (no CPE)range: < 128.11.0-1.el9_6.alma.1
- (no CPE)range: < 128.11.0-1.el9_6.alma.1
- (no CPE)range: < 128.11.0-1.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-1.1
- (no CPE)range: < 128.14.0-160000.1.1
- (no CPE)range: < 128.12.0-1.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-112.262.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-150200.152.185.1
- (no CPE)range: < 128.11.0-112.262.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.11.0-150200.8.221.1
- (no CPE)range: < 128.14.0-160000.1.1
- (no CPE)range: < 128.14.0-160000.1.1

Patches

Vulnerability mechanics

References

www.mozilla.org/security/advisories/mfsa2025-44/nvdVendor Advisory
bugzilla.mozilla.org/show_bug.cginvdPermissions Required
lists.debian.org/debian-lts-announce/2025/05/msg00043.htmlnvd
lists.debian.org/debian-lts-announce/2025/05/msg00046.htmlnvd
www.mozilla.org/security/advisories/mfsa2025-46/nvd

News mentions

No linked articles in our index yet.

cvss	0.526
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000