CVE-2026-45185
- State
- Published
- Severity
- 9.8 Critical
- Published
- May 12, 2026
- Updated
- May 14, 2026
- Reserved
- May 10, 2026
Description
Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | mitre |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
EximExim |
|
References
- https://exim.org/
- https://code.exim.org/exim/wiki/wiki/EximSecurity
- https://exim.org/static/doc/security/CVE-2026-45185.txt
- https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim
- https://news.ycombinator.com/item?id=48111748
- https://www.openwall.com/lists/oss-security/2026/05/12/4
- https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/
- http://www.openwall.com/lists/oss-security/2026/05/12/25
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