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Vulnerability record · CVE-2026-2447 · published 16 February 2026

CVE-2026-2447: Mozilla firefox heap-based buffer overflow vulnerability

Mozilla · Firefox

Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

8.8 CVSS 3.1 High EPSS 0.62% · top 52.2% CWE-122 · Heap-based buffer overflow
8.8CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
49References
15 Jul 2026Last modified by NVD

Description

Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=2014390 Issue TrackingPermissions Required
https://www.mozilla.org/security/advisories/mfsa2026-10/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-11/ Vendor Advisory
https://lists.debian.org/debian-lts-announce/2026/02/msg00028.html
https://access.redhat.com/errata/RHSA-2026:16174
https://access.redhat.com/errata/RHSA-2026:3338
https://access.redhat.com/errata/RHSA-2026:3339
https://access.redhat.com/errata/RHSA-2026:3361
https://access.redhat.com/errata/RHSA-2026:3491
https://access.redhat.com/errata/RHSA-2026:3492
https://access.redhat.com/errata/RHSA-2026:3493
https://access.redhat.com/errata/RHSA-2026:3494
https://access.redhat.com/errata/RHSA-2026:3495
https://access.redhat.com/errata/RHSA-2026:3496
https://access.redhat.com/errata/RHSA-2026:3497
https://access.redhat.com/errata/RHSA-2026:3515
https://access.redhat.com/errata/RHSA-2026:3516
https://access.redhat.com/errata/RHSA-2026:3517
https://access.redhat.com/errata/RHSA-2026:3967
https://access.redhat.com/errata/RHSA-2026:3976
https://access.redhat.com/errata/RHSA-2026:3978
https://access.redhat.com/errata/RHSA-2026:3979
https://access.redhat.com/errata/RHSA-2026:3980
https://access.redhat.com/errata/RHSA-2026:3981
https://access.redhat.com/errata/RHSA-2026:3982
https://access.redhat.com/errata/RHSA-2026:3983
https://access.redhat.com/errata/RHSA-2026:3984
https://access.redhat.com/errata/RHSA-2026:4022
https://access.redhat.com/errata/RHSA-2026:4152
https://access.redhat.com/errata/RHSA-2026:4260
https://access.redhat.com/errata/RHSA-2026:4432
https://access.redhat.com/errata/RHSA-2026:4447
https://access.redhat.com/errata/RHSA-2026:4629
https://access.redhat.com/errata/RHSA-2026:5227
https://access.redhat.com/errata/RHSA-2026:5228
https://access.redhat.com/errata/RHSA-2026:5229
https://access.redhat.com/errata/RHSA-2026:5230
https://access.redhat.com/errata/RHSA-2026:5231
https://access.redhat.com/errata/RHSA-2026:5319
https://access.redhat.com/errata/RHSA-2026:5320

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-2447), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.