Debian/exim4: high 7.5
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
Action: Upgrade exim4 to 4.98.2-1+deb13u2 or later.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 4.98.2-1+deb13u2 | - |
Fixed versions
| 4.98.2-1+deb13u2 |
Sources
- osv: DEBIAN-CVE-2026-40684#Debian:13/exim4
- https://security-tracker.debian.org/tracker/CVE-2026-40684
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