CVE-2026-8956Critical· 9.8▾ MidnightInteger overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.6%
Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
firefox < 140.11.0firefox < 151.0.0thunderbird < 140.11thunderbird < 151.0.0Upgrade past the affected range:
firefox 151.0.0thunderbird 151.0.0Connected by shared product, vendor, weakness, or advisory.
CVE-2016-9063Critical· 9.8An integer overflow during the parsing of XML using the Expat library
CVE-2026-0880High· 8.8Sandbox escape due to integer overflow in the Graphics component
CVE-2026-109783NoneMitigation bypass in the File Handling component
CVE-2026-109782NoneMitigation bypass in the File Handling component
CVE-2026-109781Medium· 6.5Denial-of-service in the Printing: Output component
CVE-2026-109780NoneMitigation bypass in the DOM: Core & HTML component