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CVE-2026-100815 is a use-after-free vulnerability (CWE-416) in the CSS Parsing and Computation component of Mozilla products. The flaw was fixed in Firefox ESR 153.4, Firefox 157, Thunderbird 153.4, and Thunderbird 157.
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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 remotely reachable, low-complexity vulnerability requiring user interaction, with high confidentiality, integrity, and availability impact according to the supplied CVSS v3 vector. It is identified as unpatched and applies to Debian Linux 12.0, 13.0, and 14.0, including Firefox ESR package context.
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.
A use-after-free vulnerability in Firefox's CSS Parsing and Computation 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.