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CVE-2026-12328 is a Mozilla vulnerability covering multiple memory safety bugs in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151, and Thunderbird 151. Mozilla reported that some of the bugs showed evidence of memory corruption and assessed that, with sufficient effort, some could potentially be exploited to run arbitrary code. The issue is described at a high level only; no specific vulnerable function or code path is identified in the provided content. The vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird ESR 140.12.
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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.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory safety vulnerability causing memory corruption in Firefox.
A memory safety vulnerability affecting Firefox and Thunderbird releases, involving memory corruption with potential arbitrary code execution.
One of the vulnerabilities fixed in Firefox 152; the content provides only aggregate counts and no technical details.
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.
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.