CVE-2026-12297
Published: 16 June 2026
Summary
CVE-2026-12297 is a critical-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Mozilla Firefox. Its CVSS base score is 9.6 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 31.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-37088
Vulnerability details
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Sandbox escape via memory corruption (CWE-119) in browser networking component directly enables client-side code execution (T1203) and subsequent privilege escalation (T1068).
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Defines isolation boundaries by specifying which external systems may access or process organization data.
Maintains isolation and compartmentalization by restricting flows between security domains or levels.
Reviewing the continued need for connections supports isolation and compartmentalization.
Locating systems away from hazards improves isolation and compartmentalization from external physical or environmental threats.
The CONOPS must articulate isolation and compartmentalization expectations for security and privacy, making architectural failures in separation of duties or domains harder to overlook.
Security architectures commonly incorporate isolation and compartmentalization strategies to limit the impact of compromises.
Organization-wide privacy program leadership ensures proper isolation and compartmentalization of personal data.
Oversight ensures data-matching activities maintain required isolation between distinct data sets and authorized user communities.