CVE-2026-40684: In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when...
MEDIUM
CVSS 5.9
Exploit Available
Published: April 30, 2026 | Last Modified: May 1, 2026
Description
In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.
Ghostwire Analysis — What This Means Practically
- Medium CVSS score indicates moderate risk — exploitation requires specific conditions or results in limited impact.
- Exploit code is reported to be available, increasing the likelihood of active exploitation.
This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.
Security Coverage (2 articles)
References