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CVE-2026-67194: Uncontrolled Recursion in svarshavchik Courier IMAPCVE-2026-67194 0 Courier IMAP before 6.0.1 and Courier Mail Server before 2.0.2 allow authenticated IMAP users to crash the imapd process via deeply nested parenthesized SEARCH queries. The SEARCH command parser (alloc_search_key in searchinfo.C) recursively descends on nested parenthesized groups through a mutual recursion chain with alloc_search_andlist() and alloc_search_notkey(), with no depth limit. Courier IMAP has no overall command line length limit, making exploitation trivial. A single IMAP command with ~2500 nested parentheses overflows the 8MB default stack, causing SIGSEGV. Join the discussion | CVE Database V5 | 07/29/2026, 16:39:09 UTC Added: 07/29/2026, 17:07:43 UTC |
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