CVE-2026-12291High· 8.8▾ TwilightUse-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 1.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
firefox < 115.37.0firefox < 152.0.0firefox >= 128.0, < 140.12.0thunderbird < 140.12.0thunderbird < 152.0.0Upgrade past the affected range:
firefox 140.12.0thunderbird 152.0.0Connected by shared product, vendor, weakness, or advisory.
CVE-2022-26486Critical· 9.6An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape
CVE-2022-26485High· 8.8Removing an XSLT parameter during processing could have lead to an exploitable use-after-free
CVE-2024-9680Critical· 9.8An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines
CVE-2025-3028Medium· 6.5JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free
CVE-2025-1931High· 7.5It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash
CVE-2025-1930High· 8.8On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a use-after-free in the Browser process