CVE-2026-48840

EUVD-2026-33446
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 17.86%
Affected Products (NVD)
VendorProductVersion
eximexim
4.88 ≤
𝑥
< 4.99.4
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
exim4
bookworm
4.96-15+deb12u10
fixed
bookworm (security)
4.96-15+deb12u10
fixed
bullseye
vulnerable
bullseye (security)
4.94.2-7+deb11u6
fixed
forky
4.100~RC3-2
fixed
sid
4.100~RC3-2
fixed
trixie
4.98.2-1+deb13u3
fixed
trixie (security)
4.98.2-1+deb13u4
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
exim4
bionic
Fixed 4.90.1-1ubuntu1.10+esm6
released
focal
Fixed 4.93-13ubuntu1.12+esm1
released
jammy
Fixed 4.95-4ubuntu2.9
released
noble
Fixed 4.97-4ubuntu4.6
released
questing
Fixed 4.98.2-1ubuntu2.3
released
resolute
Fixed 4.99.1-1ubuntu1.3
released
trusty
not-affected
xenial
Fixed 4.86.2-2ubuntu2.6+esm9
released
Common Weakness Enumeration
References
https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
https://www.openwall.com/lists/oss-security/2026/05/29/3
http://www.openwall.com/lists/oss-security/2026/05/29/3
https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html