5.3

CVE-2026-48840: exim

CVSS: 5.3v3.1MediumModified
AliasesUBUNTU-CVE-2026-48840USN-8353-1DEBIAN-CVE-2026-48840
Published 30-05-2026Last modified 05-06-2026
Open JSON

Vulnerability summary

CVE-2026-48840 is a medium (CVSS 5.3) vulnerability in exim. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 36.9% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.44%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
USN-8382-1CGA-FQW8-V5FQ-67JR

Timeline

  1. 30-05-2026
    PublishedVulnerability first disclosed.
  2. 05-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

+0.18 pp

From 0.26% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.44%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard10 products
  • exim< 4.99.5-r0
  • exim-cdb< 4.99.5-r0
  • exim-dbmdb< 4.99.5-r0
  • exim-dnsdb< 4.99.5-r0
  • exim-doc< 4.99.5-r0
Wolfi10 products
  • exim< 4.99.5-r0
  • exim-cdb< 4.99.5-r0
  • exim-dbmdb< 4.99.5-r0
  • exim-dnsdb< 4.99.5-r0
  • exim-doc< 4.99.5-r0
Debian1 product
  • exim4< 4.96-15+deb12u10 | < 4.98.2-1+deb13u3 | < 4.99.3-2
Exim1 product
  • exim≥ 4.88, < 4.99.4
Ubuntu1 product
  • exim4< 4.86.2-2ubuntu2.6+esm9 | < 4.90.1-1ubuntu1.10+esm6 | < 4.93-13ubuntu1.12+esm1 | < 4.95-4ubuntu2.9 | < 4.97-4ubuntu4.6 | < 4.98.2-1ubuntu2.3 | < 4.99.1-1ubuntu1.3

5 vendors · 23 products

References

10 links