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    CVE-2026-6754

    Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

    Published:Apr 21, 2026
    Last Modified:Apr 22, 2026
    EPS:Apr 21, 2026
    EPSS Score:0.00053
    CVSS Score:7.5

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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=2027541
    https://www.mozilla.org/security/advisories/mfsa2026-30/
    https://www.mozilla.org/security/advisories/mfsa2026-31/
    https://www.mozilla.org/security/advisories/mfsa2026-32/
    https://www.mozilla.org/security/advisories/mfsa2026-33/
    https://www.mozilla.org/security/advisories/mfsa2026-34/
    https://access.redhat.com/errata/RHSA-2026:10757
    https://access.redhat.com/errata/RHSA-2026:10766
    https://access.redhat.com/errata/RHSA-2026:10767
    https://access.redhat.com/errata/RHSA-2026:12285
    https://access.redhat.com/errata/RHSA-2026:13537
    https://access.redhat.com/errata/RHSA-2026:15892
    https://access.redhat.com/errata/RHSA-2026:17477
    https://access.redhat.com/errata/RHSA-2026:17687
    https://access.redhat.com/errata/RHSA-2026:17688
    https://access.redhat.com/errata/RHSA-2026:17689
    https://access.redhat.com/errata/RHSA-2026:17690
    https://access.redhat.com/errata/RHSA-2026:19041
    https://access.redhat.com/errata/RHSA-2026:19131
    https://access.redhat.com/errata/RHSA-2026:19201
    https://access.redhat.com/errata/RHSA-2026:19348
    https://access.redhat.com/errata/RHSA-2026:19461
    https://access.redhat.com/errata/RHSA-2026:19462
    https://access.redhat.com/errata/RHSA-2026:19463
    https://access.redhat.com/errata/RHSA-2026:19464
    https://access.redhat.com/errata/RHSA-2026:19465
    https://access.redhat.com/errata/RHSA-2026:19466
    https://access.redhat.com/errata/RHSA-2026:19467
    https://access.redhat.com/errata/RHSA-2026:19468
    https://access.redhat.com/errata/RHSA-2026:19469
    https://access.redhat.com/errata/RHSA-2026:19542
    https://access.redhat.com/errata/RHSA-2026:19655
    https://access.redhat.com/errata/RHSA-2026:19704
    https://access.redhat.com/security/cve/CVE-2026-6754
    https://bugzilla.redhat.com/show_bug.cgi?id=2460075
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6754.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