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    CVE-2026-12328

    Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

    Published:Jun 16, 2026
    Last Modified:Jun 17, 2026
    EPS:Jun 16, 2026
    EPSS Score:0.00304
    CVSS Score:8.1

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird

    Exploits

    No exploit reference

    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/buglist.cgi?bug_id=2029402%2C2038477%2C2039726%2C2041373%2C2042268%2C2042451%2C2042782%2C2042858%2C2042929%2C2042965%2C2043213
    https://www.mozilla.org/security/advisories/mfsa2026-57/
    https://www.mozilla.org/security/advisories/mfsa2026-58/
    https://www.mozilla.org/security/advisories/mfsa2026-59/
    https://www.mozilla.org/security/advisories/mfsa2026-60/
    https://www.mozilla.org/security/advisories/mfsa2026-61/
    https://access.redhat.com/errata/RHSA-2026:27717
    https://access.redhat.com/errata/RHSA-2026:27733
    https://access.redhat.com/errata/RHSA-2026:27734
    https://access.redhat.com/errata/RHSA-2026:29940
    https://access.redhat.com/errata/RHSA-2026:30846
    https://access.redhat.com/errata/RHSA-2026:33445
    https://access.redhat.com/errata/RHSA-2026:36100
    https://access.redhat.com/errata/RHSA-2026:36101
    https://access.redhat.com/errata/RHSA-2026:36102
    https://access.redhat.com/errata/RHSA-2026:36103
    https://access.redhat.com/errata/RHSA-2026:37210
    https://access.redhat.com/errata/RHSA-2026:37391
    https://access.redhat.com/errata/RHSA-2026:38506
    https://access.redhat.com/errata/RHSA-2026:38750
    https://access.redhat.com/errata/RHSA-2026:38751
    https://access.redhat.com/errata/RHSA-2026:38753
    https://access.redhat.com/errata/RHSA-2026:39011
    https://access.redhat.com/errata/RHSA-2026:39141
    https://access.redhat.com/errata/RHSA-2026:39142
    https://access.redhat.com/errata/RHSA-2026:39428
    https://access.redhat.com/errata/RHSA-2026:39706
    https://access.redhat.com/security/cve/CVE-2026-12328
    https://bugzilla.redhat.com/show_bug.cgi?id=2489218
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12328.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