CVE-2026-48840

5.3 mediumEPSS 0.3%

Medium (5.3) in exim exim. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.3 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-31)
CWE: CWE-839
Published: 2026-05-30
Modified: 2026-07-22
Record from: the NVD, synced 2026-10-19

Affected

exim:exim

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

Check your stack JSON