CVE WatchOct 5, 2026

CVE-2025-1936

jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it was ignored when retrieving the content fr

CVSS

7.3

High

EPSS

0.4%

p37

KEV

—

Exploit Today

0-100

Published: Mar 4, 2025 · Last modified: Oct 5, 2026 · CWE-158

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-09-142026-10-12

Technical 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.

Official references

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