PT-2026-41927 · Mozilla · Thunderbird+1

Andrew Creskey + 14 · Published 2026-05-19 · Updated 2026-05-19 · CVE-2026-8973

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Thunderbird version 150 Firefox version 150

Description Memory safety bugs involving memory corruption may allow an attacker to execute arbitrary code.

Recommendations Update Thunderbird to version 151. Update Firefox to version 151.

Fix

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

CVE-2026-8973

Affected Products

Firefox

Thunderbird

References · 7

• https://mozilla.org/security/advisories/mfsa2026-46 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-50 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8973 · Security Note
• https://t.me/CVEtracker/54256 · Telegram Post
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1362365%2C1860538%2C1929005%2C1983353%2C1998526%2C2023271%2C2023943%2C2024244%2C2024260%2C2024443%2C2024665%2C2024774%2C2024916%2C2025346%2C2025357%2C2025406%2C2025434%2C2025488%2C2025496%2C2025942%2C2025947%2C2025968%2C2026279%2C2027159%2C2027239%2C2027276%2C2027308%2C2027310%2C2027324%2C2027329%2C2027363%2C2027381%2C2027382%2C2027383%2C2028274%2C2028884%2C2029060%2C2029065%2C2029068%2C2029281%2C2029293%2C2029297%2C2029303%2C2029439%2C2029448%2C2029703%2C2029720%2C2029721%2C2029723%2C2029770%2C2029771%2C2029782%2C2029818%2C2029885%2C2030100%2C2030379%2C2030385%2C2030979%2C2031119%2C2031122%2C2034119%2C2034791%2C2035209%2C2036666%2C2037986 · Note
• https://twitter.com/CVEnew/status/2056870245017563370 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2056796661091905982 · Twitter Post