Riskcovery

CVE-2026-12328

Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152

State
Published
Severity
8.1 High
Published
Jun 16, 2026
Updated
Jul 15, 2026
Reserved
Jun 15, 2026

Read the record on cve.org

Description

Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Scores

CVSSScoreVectorSource
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/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-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  • CWE-825 Expired Pointer Dereference

Affected Products

ProductVersions
FirefoxMozilla
  • 115.37 through 115.*Not affected
  • 140.12 through 140.*Not affected
  • 152 and laterNot affected
ThunderbirdMozilla
  • 140.12 through 140.*Not affected
  • 152 and laterNot affected

References

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