4.3

CVE-2026-42395: open-xchange gmbh ox dovecot ce Uncontrolled Resource Consumption

CVSS: 4.3v3.1MediumDeferred
AliasesALPINE-CVE-2026-42395UBUNTU-CVE-2026-42395DEBIAN-CVE-2026-42395
Published 28-08-2026Last modified 28-08-2026
Open JSON

Vulnerability summary

CVE-2026-42395 is a medium (CVSS 4.3) Uncontrolled Resource Consumption vulnerability in open-xchange gmbh ox dovecot ce. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.6% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.35%
0%100%
Low · +0.17 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 4
MGASA-2026-0385OPENSUSE-SU-2026:11629-1OPENSUSE-SU-2026:21720-1SUSE-SU-2026:23595-1SUSE-SU-2026:4139-1

Timeline

  1. 28-08-2026
    PublishedVulnerability first disclosed.
  2. 28-08-2026
    Last modifiedVulnerability information updated.

Description

A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login process on the following login attempt. The login process is terminated, which can cause degradation or denial of service for logins. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.35%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

+0.17 pp

From 0.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.35%

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

Open-xchange gmbh2 products
Alpine1 product
  • dovecot< 2.4.5-r0
Debian1 product
  • dovecotAll versions (No fix recorded) | < 1:2.4.1+dfsg1-6+deb13u7 | < 1:2.4.5+dfsg1-1
Ubuntu1 product
  • dovecotAll versions (No fix recorded)

4 vendors · 5 products

References

5 links