| Name | CVE-2025-67896 |
| Description | Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation. |
| 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) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| exim4 (PTS) | bullseye | 4.94.2-7+deb11u3 | fixed |
| bullseye (security) | 4.94.2-7+deb11u4 | fixed |
| bookworm, bookworm (security) | 4.96-15+deb12u7 | fixed |
| trixie | 4.98.2-1 | fixed |
| forky, sid | 4.99.1-1 | 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 | (not affected) | | | |
| exim4 | source | bookworm | (not affected) | | | |
| exim4 | source | trixie | (not affected) | | | |
| exim4 | source | (unstable) | 4.99-7 | | | |
Notes
[trixie] - exim4 <not-affected> (Vulnerable code not present)
[bookworm] - exim4 <not-affected> (Vulnerable code not present)
[bullseye] - exim4 <not-affected> (Vulnerable code not present)
https://www.openwall.com/lists/oss-security/2025/12/11/2
https://code.exim.org/exim/exim/commit/4a11617127599c2a40552f5f7e9bf0e863f10e8d
https://www.openwall.com/lists/oss-security/2025/12/18/3