Home / mailings [SECURITY] [DSA 6309-1] exim4 security update
Posted on 29 May 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6309-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
May 29, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------
Package : exim4
CVE ID : CVE-2026-48840
Warisjeet Singh discovered that Exim, a mail transport agent, does not
properly handle PROXY frames whose declared payload length is too short
for the claimed address family, which may result in information
disclosure in configurations with SUPPORT_PROXY and 'host_proxy' set.
For the oldstable distribution (bookworm), this problem has been fixed
in version 4.96-15+deb12u10.
For the stable distribution (trixie), this problem has been fixed in
version 4.98.2-1+deb13u3.
We recommend that you upgrade your exim4 packages.
For the detailed security status of exim4 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/exim4
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
