Skip to content
fr Sign in
6.5 Medium

CVE-2026-52687 An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression…

Description

An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several such connections. The memory limit of the process is reached with only a few connections, terminating the process and all connections it handles, which can cause degradation or denial of service for IMAP. Disable IMAP compression. Alternatively limit the number of connections handled by a single imap-login process, though this has a performance impact. Update to non-vulnerable version. No publicly available exploits are known.

Affected products and versions

Product Affected versions Fixed in
OX Dovecot Pro 3.1 3.1.0 → < 3.1.6 3.1.6
OX Dovecot Pro 3.0 3.0.0 → < 3.0.7 3.0.7
OX Dovecot Pro 2.3 2.3.11 → < 2.3.22.2 2.3.22.2
OX Dovecot CE 2.3 2.3.11 → < 2.4.5 2.4.5

References

Timeline

  1. Published
  2. Last modified

Other CVEs of OX Dovecot Pro

The 44 CVEs of OX Dovecot Pro →
CVE-2026-73209 An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust… 6.5 Medium CVE-2026-73208 An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token… 7.4 High CVE-2026-52681 Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the… 3.1 Low CVE-2026-42395 A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login… 4.3 Medium
Track this CVE