CVE-2025-5262

HIGH

Thunderbird < 128.11.0 and < 139.0 - Use-After-Free in vpx_codec_enc_init_multi

Title source: llm

Description

A double-free could have occurred in `vpx_codec_enc_init_multi` after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 139 and Thunderbird < 128.11.

References (3)

Core 3

Core References

Issue Tracking, Permissions Required

https://bugzilla.mozilla.org/show_bug.cgi?id=1962421

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-45/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-46/

Scores

CVSS v3 7.5

EPSS 0.0036

EPSS Percentile 27.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-415

Status published

Products (2)

mozilla/thunderbird < 128.11.0

mozilla/thunderbird < 139.0

Published May 27, 2025

Tracked Since Feb 18, 2026