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
mitreCNA
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: 8%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
eximexim
4.88 ≤
𝑥
< 4.99.4
CNA
Debian logo
Debian Releases
Debian Product
Codename
exim4
bookworm
vulnerable
bookworm (security)
4.96-15+deb12u10
fixed
bullseye
vulnerable
bullseye (security)
vulnerable
forky
vulnerable
sid
4.99.3-2
fixed
trixie
vulnerable
trixie (security)
4.98.2-1+deb13u3
fixed
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