Vulnerability details
CVE-2025-1936
Adding %00 and a fake extension to a jar: URL changed the interpretation of the contents
CVSS 3.1
7.3High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.3High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| No product information recorded. | |||
References and advisories
6- 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
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Details
- Published
- 2025-03-04
- Last updated
- 2026-04-13
- State
- Published
- Assigner (CNA)
- mozilla
Exploit prediction (EPSS)
0.44%
Probability of exploitation in 30 days
39%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-158Improper Neutralization of Null Byte or NUL Character