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CVE-2026-12307 Details

Description

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

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2038133 [email protected]Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-57/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-58/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-60/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-61/ [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferCISA-ADP

Affected Products

ProductVersions
mozilla firefox
< 140.12.0
< 152.0.0

CPE

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.
mozilla thunderbird
< 140.12.0
< 152.0.0

CPE

  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.

Change History

7 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-12307
NVD Published Date:
Jun 16, 2026
NVD Last Modified:
Jun 18, 2026
Source:
[email protected]
CVE-2026-12307 Details - Not Deferred