| Name | CVE-2026-48840 |
| Description | Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client. |
| 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-4615-1, DSA-6309-1 |
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+deb11u6 | fixed | |
| bookworm | 4.96-15+deb12u9 | vulnerable | |
| bookworm (security) | 4.96-15+deb12u10 | fixed | |
| trixie | 4.98.2-1+deb13u2 | vulnerable | |
| trixie (security) | 4.98.2-1+deb13u3 | fixed | |
| forky, sid | 4.99.4-1 | 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 | 4.94.2-7+deb11u6 | DLA-4615-1 | ||
| exim4 | source | bookworm | 4.96-15+deb12u10 | DSA-6309-1 | ||
| exim4 | source | trixie | 4.98.2-1+deb13u3 | DSA-6309-1 | ||
| exim4 | source | (unstable) | 4.99.3-2 |
https://www.openwall.com/lists/oss-security/2026/05/29/3
https://www.exim.org/static/doc/security/EXIM-Security-2026-05-19.1/EXIM-Security-2026-05-19.1.txt
Fixed by: https://code.exim.org/exim/exim/commit/aae0c4c3fba1f7e50971ba250ddbbedb583d48a6 (exim-4.99.4)