CVE-2026-12306CWE-119

CVE-2026-12306

Medium · published June 16, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
16.9
In the wild
Unconfirmed
What it is

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00261 · 16.9th percentile
Weakness
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer
Published
2026-06-16T17:16Z
Affected products (4)
ProductVersionsFixed in
mozilla/firefox< 140.12.0140.12.0
mozilla/firefox< 152.0.0152.0.0
mozilla/thunderbird< 140.12.0140.12.0
mozilla/thunderbird< 152.0.0152.0.0
References (5)
https://bugzilla.mozilla.org/show_bug.cgi?id=2037323 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-57/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-58/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-60/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-61/ · [email protected]
EPSS history
Timeline
  • 16 JUN 11:52Z
    Memory safety bug fixed in Firefox 152
    cvelistv5