CVEvulnerability
CVE-2026-45185
9.8 CRITICAL
Official page ↗
- Status
- Analyzed
- Published
- 2026-05-12
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-416
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.
Affected configurations
• exim exim (>= 4.97 < 4.99.3)
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://code.exim.org/exim/wiki/wiki/EximSecurity Vendor Advisory
- https://exim.org Product
- https://exim.org/static/doc/security/CVE-2026-45185.txt Broken Link
- https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/ Release Notes
- https://news.ycombinator.com/item?id=48111748 Issue Tracking
- https://www.openwall.com/lists/oss-security/2026/05/12/4 Mailing List, Third Party Advisory
- https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/05/12/25 Mailing List, Third Party Advisory