CVE-2026-100815High· 8.8▾ TwilightUse-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
— → 8.8
none → high
0.2%
0.2% → 0.2%
Last analysed / modified upstream
Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
firefox < 153.4.0firefox >= 154.0.0, < 157.0.0thunderbird < 153.4.0thunderbird >= 154.0, < 157.0Upgrade past the affected range:
firefox 157.0.0thunderbird 157.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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