| Name | CVE-2026-45185 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4580-1, DSA-6265-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| exim4 (PTS) | bullseye | 4.94.2-7+deb11u3 | vulnerable |
| bullseye (security) | 4.94.2-7+deb11u5 | fixed | |
| bookworm | 4.96-15+deb12u9 | fixed | |
| bookworm (security) | 4.96-15+deb12u10 | fixed | |
| trixie | 4.98.2-1+deb13u2 | fixed | |
| trixie (security) | 4.98.2-1+deb13u3 | fixed | |
| forky, sid | 4.99.3-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| exim4 | source | bullseye | 4.94.2-7+deb11u5 | DLA-4580-1 | ||
| exim4 | source | bookworm | 4.96-15+deb12u9 | DSA-6265-1 | ||
| exim4 | source | trixie | 4.98.2-1+deb13u2 | DSA-6265-1 | ||
| exim4 | source | (unstable) | 4.99.2-2 |
https://code.exim.org/exim/exim/commit/040c1ce6889f435206677ed532c9a4185cf0bcaf
https://www.openwall.com/lists/oss-security/2026/05/12/4
https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/EXIM-Security-2026-05-01.1.txt
https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim