CVE-2025-1936

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-03-04 14:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-05 15:10 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.4% in the next 30 days (EPSS).
• Severity: 7.3 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2025-03-04 14:15 UTC

Last modified

2026-10-05 15:10 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-158

Record status

Modified

Affected

• Mozilla Firefox < 128.8.0
• Mozilla Firefox < 136.0
• Mozilla Thunderbird < 128.8.0
• Mozilla Thunderbird < 136.0

Attack profile CVSS 3.1 · 7.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2025-1936.md and follow it. Check whether this project is affected by CVE-2025-1936. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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