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CVE-2026-42006

4.3 medium SSVC exploitation: none Modified
NVD · CVE.org

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 4.3 · dovecot, open-xchangeNVD modified 2026-10-26 18:10

Affected (CPE criteria) 2

  • cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*
  • cpe:2.3:a:open-xchange:dovecot:*:*:*:*:pro:*:*:*

References 15