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CVE-2026-100814 is an incorrect boundary-conditions vulnerability in the Mozilla JavaScript Engine JIT component. Mozilla fixed the issue in Firefox 157, Firefox ESR 153.4, Thunderbird 157, and Thunderbird 153.4. Technical details of the vulnerable JIT operation and exploitation mechanism have not been disclosed.
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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.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A newly published, unpatched vulnerability affecting Debian Linux 12.0, 13.0, and 14.0, including the Firefox ESR package context. It is remotely reachable with low attack complexity, requires user interaction, and is rated as having high potential confidentiality, integrity, and availability impact under CVSS v3.
An unspecified vulnerability addressed by upgrading Mozilla Thunderbird to version 153.4 or later.
Referenced as affecting Mozilla Thunderbird versions earlier than 153.4; the specific flaw is not described.
An incorrect boundary-conditions vulnerability in Firefox's JavaScript Engine JIT component.
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.