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Allocation of Resources Without Limits or Throttling The advisory has been revoked - it doesn't affect any version of package dovecot-pigeonhole  (opens in a new tab)

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EPSS
0.62% (50th percentile)

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  • Snyk IDSNYK-RHEL7-DOVECOTPIGEONHOLE-17936918
  • published10 Jul 2026
  • disclosed12 May 2026
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Introduced: 12 May 2026

CVE-2026-42006  (opens in a new tab)
CWE-770  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dovecot-pigeonhole package and not the dovecot-pigeonhole package as distributed by RHEL.

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.

References