PT-2026-49696 · Mozilla · Firefox

Published 2026-06-16 · Updated 2026-06-16 · CVE-2026-12327

NVD

Memory safety bugs present in 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 and Firefox ESR 140.12.

Related Identifiers

CVE-2026-12327

Affected Products

Firefox

References · 4

• https://mozilla.org/security/advisories/mfsa2026-57 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-12327 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-58 · Vendor Advisory
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2011842%2C2023902%2C2025512%2C2027312%2C2029444%2C2036571%2C2036900%2C2036936%2C2037995%2C2038551%2C2040717%2C2042724 · Note