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CVE-2026-12327 covers multiple memory safety bugs affecting Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151, and Thunderbird 151. Mozilla states that some of these bugs showed evidence of memory corruption and assessed that, with sufficient effort, some could potentially be exploited to run arbitrary code. The available content does not identify the individual vulnerable functions or root-cause bug classes beyond describing them collectively as memory safety issues.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One of the specifically named vulnerabilities referenced in the Firefox 152 security fixes. The content does not describe the flaw type beyond noting it was among vulnerabilities fixed in the release.
One of the vulnerabilities fixed in Firefox 152; the content provides only aggregate counts and no technical details.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.