CVE-2026-8973CWE-119CWE-787

CVE-2026-8973

High · published May 19, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
38.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00458 · 38.7th percentile
Weaknesses
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer; CWE-787 · Out-of-bounds Write
Published
2026-05-19T18:16Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 151.0.0151.0.0
mozilla/thunderbird< 151.0.0151.0.0
References (6)
https://www.mozilla.org/security/advisories/mfsa2026-50/ · [email protected]https://access.redhat.com/security/cve/CVE-2026-8973 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2479864 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8973.json · 0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://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 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-46/ · [email protected]
EPSS history
Timeline
  • 19 MAY 12:30Z
    Memory safety bugs fixed in Firefox 151
    cvelistv5