Heap buffer overflow opening large email
Summary
| CVE | CVE-2026-103500 |
|---|---|
| State | PUBLISHED |
| Assigner | mozilla |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-30 18:18:18 UTC |
| Updated | 2026-09-30 19:05:23 UTC |
| Description | An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4. |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Mozilla | Thunderbird | unaffected 140.17 140.* rpm | Not specified |
| CNA | Mozilla | Thunderbird | unaffected 153.4 153.* rpm | Not specified |
| CNA | Mozilla | Thunderbird | unaffected 157 * rpm | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.mozilla.org/security/advisories/mfsa2026-102 | [email protected] | www.mozilla.org | |
| www.mozilla.org/security/advisories/mfsa2026-103 | [email protected] | www.mozilla.org | |
| bugzilla.mozilla.org/show_bug.cgi | [email protected] | bugzilla.mozilla.org | |
| www.mozilla.org/security/advisories/mfsa2026-101 | [email protected] | www.mozilla.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Ahmed Albalawi (en)
There are currently no legacy QID mappings associated with this CVE.