CVE-2026-16360Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153
- 9.8CriticalCVSS base score
- 0.47%Exploitation in 30 daysEPSS · top 59% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. 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 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Timeline
ID reserved
By mozilla
- 1 day later
· 1 day later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.47% · top 59% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- unaffected 115.38 – ≤ 115.*
- unaffected 140.13 – ≤ 140.*
- unaffected 153 – ≤ *
- unaffected 140.13 – ≤ 140.*
- unaffected 153 – ≤ *
References
References7
- High-severity memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153 (opens in a new tab)
- Moderate-severity memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153 (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-68/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-69/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-70/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-71/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2026-72/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-46251 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-16360)Record last updated .