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Vulnerability IntelligenceCVE-2026-12306

CVE-2026-12306

MEDIUM5.3

Memory safety bug fixed in Firefox 152

Published Jun 16, 2026

Modified 1 weeks ago

Details

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

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2037323

https://www.cve.org/CVERecord?id=CVE-2026-12306

https://www.mozilla.org/security/advisories/mfsa2026-57/

https://www.mozilla.org/security/advisories/mfsa2026-58/

https://www.mozilla.org/security/advisories/mfsa2026-60/

https://www.mozilla.org/security/advisories/mfsa2026-61/

CVSS Analysis

CVSS v3.1

5.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

LowC:L

Integrity

NoneI:N

Availability

NoneA:N

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

Ecosystems

Timeline

PublishedJun 16, 2026

ModifiedJun 18, 2026

CVE-2026-12306 | Mondoo Vulnerability Intelligence