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    CVE-2026-8092

    Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

    Published:May 7, 2026
    Last Modified:May 18, 2026
    EPS:May 7, 2026
    EPSS Score:0.00022
    CVSS Score:8.1

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    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/buglist.cgi?bug_id=1806249%2C2021977%2C2022576%2C2022722%2C2024439%2C2027883%2C2029463%2C2030323%2C2032042%2C2032043%2C2033270%2C2033637%2C2034422%2C2034496%2C2035879%2C2036516
    https://www.mozilla.org/security/advisories/mfsa2026-40/
    https://www.mozilla.org/security/advisories/mfsa2026-41/
    https://www.mozilla.org/security/advisories/mfsa2026-42/
    https://www.mozilla.org/security/advisories/mfsa2026-43/
    https://www.mozilla.org/security/advisories/mfsa2026-44/
    https://access.redhat.com/errata/RHSA-2026:19160
    https://access.redhat.com/errata/RHSA-2026:20566
    https://access.redhat.com/errata/RHSA-2026:20574
    https://access.redhat.com/errata/RHSA-2026:21381
    https://access.redhat.com/errata/RHSA-2026:22325
    https://access.redhat.com/errata/RHSA-2026:22643
    https://access.redhat.com/errata/RHSA-2026:24508
    https://access.redhat.com/errata/RHSA-2026:24509
    https://access.redhat.com/errata/RHSA-2026:24510
    https://access.redhat.com/errata/RHSA-2026:24511
    https://access.redhat.com/errata/RHSA-2026:24516
    https://access.redhat.com/errata/RHSA-2026:24755
    https://access.redhat.com/errata/RHSA-2026:24983
    https://access.redhat.com/errata/RHSA-2026:25015
    https://access.redhat.com/errata/RHSA-2026:26174
    https://access.redhat.com/errata/RHSA-2026:26268
    https://access.redhat.com/errata/RHSA-2026:26269
    https://access.redhat.com/errata/RHSA-2026:26270
    https://access.redhat.com/errata/RHSA-2026:26521
    https://access.redhat.com/errata/RHSA-2026:26536
    https://access.redhat.com/errata/RHSA-2026:26539
    https://access.redhat.com/security/cve/CVE-2026-8092
    https://bugzilla.redhat.com/show_bug.cgi?id=2467708
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8092.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