Thunderbird <=159/153.6 snews: SSRF & command injection (CVE-2026-118179)
CVE-2026-118179 Published on October 27, 2026
Request forgery via news: links
Clicking a news: or snews: link that referenced a message-ID made Thunderbird connect, without asking, to the host and port given in the link, even if it was not a configured news server. Line breaks in the message-ID were sent to the server unmodified, so a crafted link could send arbitrary commands to services reachable from the user's network. In addition, snews: links to such servers connected without TLS. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.
Vulnerability Analysis
CVE-2026-118179 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-118179
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Affected Versions
Mozilla Thunderbird:- Version 153.6, <= 153.* is unaffected.
- Version 159, <= * is unaffected.