CVE-2026-12306
Description
Memory safety bug in Firefox <152 and Firefox ESR <140.12 could allow arbitrary code execution; patched in June 2026.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Memory safety bug in Firefox <152 and Firefox ESR <140.12 could allow arbitrary code execution; patched in June 2026.
Vulnerability
A memory safety bug was fixed in Firefox 152 and Firefox ESR 140.12 [1][2]. The exact component is undisclosed, but the bug is classified as a memory safety issue. Affected versions are Firefox prior to 152 and Firefox ESR prior to 140.12.
Exploitation
Exploitation details are not publicly disclosed. Memory safety bugs are typically triggered by processing crafted web content, leading to memory corruption.
Impact
The vulnerability has a high severity rating [1][2]. If exploited, an attacker could achieve arbitrary code execution in the context of the browser process, potentially leading to full system compromise.
Mitigation
Users should update to Firefox 152 or Firefox ESR 140.12, released on June 16, 2026. No workarounds are available. The fix is included in the respective security advisories [1][2].
AI Insight generated on Jun 16, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
3- Range: <= 140.12
- Range: <= 140.12
Patches
0No patches discovered yet.
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
5News mentions
0No linked articles in our index yet.