Unrated
Heap buffer overflow opening large email
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.
Announced Group revision 1
Original source ↗CVE-2026-103500
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-103500
Thunderbird
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Mozilla",
"product": "Thunderbird",
"versions": [
{
"status": "unaffected",
"version": "140.17",
"versionType": "rpm",
"lessThanOrEqual": "140.*"
},
{
"status": "unaffected",
"version": "153.4",
"versionType": "rpm",
"lessThanOrEqual": "153.*"
},
{
"status": "unaffected",
"version": "157",
"versionType": "rpm",
"lessThanOrEqual": "*"
}
]
}
]- Related CVEs
- CVE-2026-103500
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #49302 · Revision 1
- Added to Heist Feed
- Publisher date