CVE-2026-92238Medium· 6.1▾ SunlitA maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
▾ Sunlit zone — Low / medium · no exploitation signal
impact 33.6 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
— → 6.1
none → medium
0.2%
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-92239Medium· 6.1A maliciously constructed IMAP line could cause an out-of-bounds buffer read
CVE-2026-92240Low· 3.4A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged '* ID' response, crashing Thunderbird
CVE-2026-92006High· 8.8Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
CVE-2026-92015High· 8.8Privilege escalation in the WebExtensions component
CVE-2026-92007High· 8.8Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
CVE-2026-92005Medium· 5.3Use-after-free in the Audio/Video: Web Codecs component