Sandbox escape due to incorrect boundary conditions in the Internationalization component (Mozilla Thunderbird)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.32 % · percentile 25 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- mozilla
- NVD status
- Analyzed
Description
Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Weaknesses (CWE)
- CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2028871
- https://www.mozilla.org/security/advisories/mfsa2026-100/
- https://www.mozilla.org/security/advisories/mfsa2026-101/
- https://www.mozilla.org/security/advisories/mfsa2026-102/
- https://www.mozilla.org/security/advisories/mfsa2026-103/
- https://www.mozilla.org/security/advisories/mfsa2026-97/
- https://www.mozilla.org/security/advisories/mfsa2026-99/
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H | CISA-ADP |
| CVSS 3.1 | CRITICAL 9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H | NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-88946
- GCVE · GCVE-0-2026-100794
CERT-FR advisories
- CERTFR-2026-AVI-1244 — Multiples vulnérabilités dans Mozilla Thunderbird · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1240 — Multiples vulnérabilités dans les produits Mozilla · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*< 140.17.0cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*≥ 141.0 < 153.4.0cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*≥ 154.0.0 < 157.0.0cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*< 140.17.0cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*≥ 141.0 < 153.4.0cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*≥ 154.0 < 157.0
Affected products
| Product | Versions |
|---|---|
| Mozilla · Thunderbird | unaffected 140.17 ≤ 140.* ; unaffected 153.4 ≤ 153.* ; unaffected 157 ≤ * |
| Mozilla · Firefox | unaffected 140.17 ≤ 140.* ; unaffected 153.4 ≤ 153.* ; unaffected 157 ≤ * |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |