CVE-2025-1936
Adding %00 and a fake extension to a jar: URL changed the interpretation of the contents
CVSS Score
7.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Mar 4, 2025 |
| Last Updated | Apr 13, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1940027 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-14/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-16/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-17/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-18/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html
Credits
Surya Dev Singh