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7.3HIGH
CVE-2025-1936 — jar: URLs retrieve local file content packaged in a ZIP archive.
Mozilla · Firefox · Published 4 Mar 2025 · Modified 30 Sept 2026
Description
jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it was ignored when retrieving the content from the archive, but the fake extension after the null was used to determine the type of content. This could have been used to hide code in a web extension disguised as something else like an image. This vulnerability was fixed in Firefox 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1940027
- https://www.mozilla.org/security/advisories/mfsa2025-14/
- https://www.mozilla.org/security/advisories/mfsa2025-16/
- https://www.mozilla.org/security/advisories/mfsa2025-17/
- https://www.mozilla.org/security/advisories/mfsa2025-18/
- https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html
What to do
- Check whether Firefox is in your asset inventory.
- Patch in the next maintenance window; prioritise internet-facing systems.
- Record the decision in your risk register for audit evidence.
Share
Link: adminadda.com/cve/CVE-2025-1936