CVE-2026-12328

Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152

CVSS 8.1 HIGHEPSS 0.5%CWE-120 CWE-825

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.1EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado

Lifecycle

16 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mozilla · Firefox Mozilla · Thunderbird

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References

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/security/cve/CVE-2026-12328 https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029402%2C2038477%2C2039726%2C2041373%2C2042268%2C2042451%2C2042782%2C2042858%2C2042929%2C2042965%2C2043213 https://bugzilla.redhat.com/show_bug.cgi?id=2489218 https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12328.json https://www.mozilla.org/security/advisories/mfsa2026-57/https://www.mozilla.org/security/advisories/mfsa2026-58/