CVE-2026-8973

Memory safety bugs present in Thunderbird 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Score

CVSS 3.1 8.8 High

Status

Modified - security@mozilla.org

Published

2026-05-19

Last modified

2026-10-21

Weaknesses

CWE-119, CWE-787

Affected products

• Firefox (Mozilla)
• Thunderbird (Mozilla)
• Enterprise Linux (Redhat)

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1362365%2C1860538%2C1929005%2C1983353%2C1998526%2C2023271%2C2023943%2C2…
• https://www.mozilla.org/security/advisories/mfsa2026-46/
• https://www.mozilla.org/security/advisories/mfsa2026-50/
• https://access.redhat.com/security/cve/CVE-2026-8973
• https://bugzilla.redhat.com/show_bug.cgi?id=2479864
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8973.json