Several buffer-growth sites in libmime performed size arithmetic in 32-bit types without overflow checks. On a sufficiently large message the growth guard could fail open, or the buffer could be reallocated smaller than required, and a subsequent memcpy would then write attacker-controlled data across adjacent heap allocations. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.6.
References
Configurations
No configuration.
History
27 Oct 2026, 19:17
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | (en) Several buffer-growth sites in libmime performed size arithmetic in 32-bit types without overflow checks. On a sufficiently large message the growth guard could fail open, or the buffer could be reallocated smaller than required, and a subsequent memcpy would then write attacker-controlled data across adjacent heap allocations. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.6. | |
| References |
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20 Oct 2026, 18:17
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 8.4 |
| CWE | CWE-190 |
13 Oct 2026, 19:18
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-13 19:18
Updated : 2026-10-27 19:17
NVD link : CVE-2026-110247
Mitre link : CVE-2026-110247
CVE.ORG link : CVE-2026-110247
JSON object : View
Products Affected
No product.
CWE
CWE-190
Integer Overflow or Wraparound