Riskcovery

CVE-2026-8975

Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151

State
Published
Severity
8.8 High
Published
May 19, 2026
Updated
Oct 21, 2026
Reserved
May 19, 2026

Read the record on cve.org

Description

Memory safety bugs present in Thunderbird 140.10 and 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, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Scores

CVSSScoreVectorSource
3.18.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCISA-ADP
3.17.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Hredhat-SADP

Weaknesses

  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

Affected Products

ProductVersions
FirefoxMozilla
  • 115.36 through 115.*Not affected
  • 140.11 through 140.*Not affected
  • 151 and laterNot affected
ThunderbirdMozilla
  • 140.11 through 140.*Not affected
  • 151 and laterNot affected

References

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