3.1

CVE-2026-52681: open-xchange gmbh ox dovecot ce

CVSS: 3.1v3.1LowDeferred
AliasesALPINE-CVE-2026-52681UBUNTU-CVE-2026-52681DEBIAN-CVE-2026-52681
Published 28-08-2026Last modified 28-08-2026
Open JSON

Vulnerability summary

CVE-2026-52681 is a low (CVSS 3.1) vulnerability in open-xchange gmbh ox dovecot ce. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 20.9% of scored vulnerabilities.

Overall risk
12/100
0100
Low · default modelHow is this calculated?
CVSS score
3.1/10
010
Low · v3.1 (CVE.org)
EPSS score
0.30%
0%100%
Low · +0.04 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

Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script. Compiled script files are also not removed when a script is deleted or renamed. The configured Sieve CPU limit can be bypassed, allowing sustained CPU consumption, and the leftover files increase disk consumption. Both can cause degradation of service for mail delivery. Monitor system for abnormal CPU usage and disk consumption. Update to non-vulnerable version. No publicly available exploits are known.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

+0.04 pp

From 0.25% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.30%

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