CVE-2025-11719 — Use After Free in Mozilla Firefox

CWE-416 — Use After Free8 documents7 sources
Severity
9.8CRITICALNVD
EPSS
0.1%
top 81.01%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedOct 14

Description

Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption. This vulnerability was fixed in Firefox 144 and Thunderbird 144.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages2 packages

▶NVDmozilla/thunderbird143.0 — 144.0
▶NVDmozilla/firefox143.0 — 144.0

🔴Vulnerability Details

3
CVEList
Use-after-free caused by the native messaging web extension API on Windows↗2025-10-14
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OSV
CVE-2025-11719: Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory co↗2025-10-14
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GHSA
GHSA-wvmm-cxmc-39xj: Starting in Firefox 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corrup↗2025-10-14
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📋Vendor Advisories

4
Red Hat
thunderbird: firefox: Use-after-free caused by the native messaging web extension API on Windows↗2025-10-14
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Debian
CVE-2025-11719: firefox - Starting in Thunderbird 143, the use of the native messaging API by web extensio...↗2025
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Mozilla
Mozilla Foundation Security Advisory 2025-84: CVE-2025-11719↗
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Mozilla
Mozilla Foundation Security Advisory 2025-81: CVE-2025-11719↗
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CVE-2025-11719 — Use After Free in Mozilla Firefox | cvebase