Vulnerability · Published Mar 4, 2025 · Assigned by mozilla
CVE-2025-1936Adding %00 and a fake extension to a jar: URL changed the interpretation of the contents
High 7.3
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | firefox | 128.8.0-1.el8_10 | ALSA-2025:2452 |
| AlmaLinux:9 | firefox | 128.8.0-1.el9_5 | ALSA-2025:2359 |
| AlmaLinux:9 | firefox-x11 | 128.8.0-1.el9_5 | ALSA-2025:2359 |
| Debian:12 | firefox-esr | 128.8.0esr-1~deb12u1 | DSA-5874-1 |
| Debian:12 | firefox-esr | 128.8.0esr-1~deb12u1 | DEBIAN-CVE-2025-1936 |
| Debian:13 | firefox-esr | 128.8.0esr-1 | DEBIAN-CVE-2025-1936 |
| Debian:14 | firefox-esr | 128.8.0esr-1 | DEBIAN-CVE-2025-1936 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DEBIAN-CVE-2025-1936 |
| Debian:12 | thunderbird | 1:128.8.0esr-1~deb12u1 | DSA-5876-1 |
| Debian:13 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-1936 |
| Debian:14 | thunderbird | 1:128.8.0esr-1 | DEBIAN-CVE-2025-1936 |
| Rocky Linux:8 | firefox | 0:128.8.0-1.el8_10 | RLSA-2025:2452 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-1936 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-1936 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-1936 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-1936 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-1936 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-1936 |
| Ubuntu:22.04:LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-158 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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