CVE WatchJul 15, 2026

CVE-2026-42006

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking on

CVSS

4.3

Medium

EPSS

0.5%

p37

KEV

—

Exploit Today

0-100

Published: May 12, 2026 · Last modified: Jul 15, 2026 · CWE-400 · CWE-770

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-06-302026-07-18

Technical description

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.

Official references

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