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    CVE-2026-8091

    Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

    Published:May 7, 2026
    Last Modified:Aug 11, 2026
    EPS:May 7, 2026
    EPSS Score:0.00469
    CVSS Score:9.8

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-100 Overflow Buffers
    CAPEC-256 SOAP Array 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=2029301
    https://www.mozilla.org/security/advisories/mfsa2026-30/
    https://www.mozilla.org/security/advisories/mfsa2026-33/
    https://www.mozilla.org/security/advisories/mfsa2026-36/
    https://www.mozilla.org/security/advisories/mfsa2026-39/
    https://www.mozilla.org/security/advisories/mfsa2026-42/
    https://access.redhat.com/errata/RHSA-2026:19153
    https://access.redhat.com/errata/RHSA-2026:19157
    https://access.redhat.com/errata/RHSA-2026:19348
    https://access.redhat.com/errata/RHSA-2026:19370
    https://access.redhat.com/errata/RHSA-2026:19588
    https://access.redhat.com/errata/RHSA-2026:20586
    https://access.redhat.com/errata/RHSA-2026:21743
    https://access.redhat.com/errata/RHSA-2026:22324
    https://access.redhat.com/errata/RHSA-2026:22408
    https://access.redhat.com/errata/RHSA-2026:22409
    https://access.redhat.com/errata/RHSA-2026:22410
    https://access.redhat.com/errata/RHSA-2026:22708
    https://access.redhat.com/errata/RHSA-2026:22712
    https://access.redhat.com/errata/RHSA-2026:22847
    https://access.redhat.com/errata/RHSA-2026:24345
    https://access.redhat.com/errata/RHSA-2026:24717
    https://access.redhat.com/errata/RHSA-2026:24718
    https://access.redhat.com/errata/RHSA-2026:24719
    https://access.redhat.com/errata/RHSA-2026:24721
    https://access.redhat.com/errata/RHSA-2026:24844
    https://access.redhat.com/errata/RHSA-2026:24846
    https://access.redhat.com/errata/RHSA-2026:25014
    https://access.redhat.com/security/cve/CVE-2026-8091
    https://bugzilla.redhat.com/show_bug.cgi?id=2467699
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8091.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