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    CVE-2026-2447

    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.

    Published:Feb 16, 2026
    Last Modified:Apr 15, 2026
    EPS:Feb 16, 2026
    EPSS Score:0.00017
    CVSS Score:8.8

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Firefox Esr
    Vendor
    Mozilla
    Product
    Thunderbird

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-122 Heap-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-84144 (CVSS 7.5) — Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence…
    CVE-2026-84143 (CVSS 9.8) — Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of th…
    CVE-2026-84142 (CVSS 9.8) — Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or a…
    CVE-2026-84141 (CVSS 9.8) — Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR…
    CVE-2026-84140 (CVSS 9.8) — Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ES…
    CVE-2026-84139 (CVSS 6.1) — Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.…
    CVE-2026-84138 (CVSS 6.5) — Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155…
    CVE-2026-84137 (CVSS 4.3) — Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153…
    CVE-2026-84136 (CVSS 6.1) — Other issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, …
    CVE-2026-84135 (CVSS 9.8) — Other issue in Firefox Focus for Android. This vulnerability was fixed in Firefox 155.…

    References

    https://bugzilla.mozilla.org/show_bug.cgi?id=2014390
    https://www.mozilla.org/security/advisories/mfsa2026-10/
    https://www.mozilla.org/security/advisories/mfsa2026-11/
    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
    https://access.redhat.com/errata/RHSA-2026:5323
    https://access.redhat.com/errata/RHSA-2026:5324
    https://access.redhat.com/errata/RHSA-2026:5326
    https://access.redhat.com/errata/RHSA-2026:8746
    https://access.redhat.com/errata/RHSA-2026:8747
    https://access.redhat.com/errata/RHSA-2026:8748
    https://access.redhat.com/security/cve/CVE-2026-2447
    https://bugzilla.redhat.com/show_bug.cgi?id=2440219
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2447.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High