CVE-2025-9181

Uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 142, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

Score

CVSS 3.1 6.5 Medium

Status

Modified - security@mozilla.org

Published

2025-08-19

Last modified

2026-10-05

Weaknesses

CWE-457

Affected products

• Firefox (Mozilla)
• Thunderbird (Mozilla)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1977130
• https://www.mozilla.org/security/advisories/mfsa2025-64/
• https://www.mozilla.org/security/advisories/mfsa2025-66/
• https://www.mozilla.org/security/advisories/mfsa2025-67/
• https://www.mozilla.org/security/advisories/mfsa2025-70/
• https://www.mozilla.org/security/advisories/mfsa2025-71/
• https://www.mozilla.org/security/advisories/mfsa2025-72/
• https://lists.debian.org/debian-lts-announce/2025/08/msg00018.html
• https://lists.debian.org/debian-lts-announce/2025/08/msg00016.html