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CVE-2026-12329 is a memory safety vulnerability affecting Mozilla Thunderbird and Firefox ESR, fixed in Thunderbird 140.12 and Firefox ESR 140.12. The available advisory text only identifies it generically as a 'memory safety bug' and does not disclose the specific vulnerable component, function, or root cause beyond indicating a memory corruption class issue. Mozilla and downstream advisories group it among multiple security fixes and note that memory safety flaws of this type can potentially be exploitable for application instability, denial of service, memory corruption, and possibly arbitrary code execution.
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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.
11 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.