CVE-2026-67194 Courier IMAP < 6.0.1 Mail Server < 2.0.2 Stack Overflow DoS via Nested SEARCH Queries

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 allocsearchkey in searchinfo.C recursively descends on nested parenthesized groups through a mutual...

CVE-2026-67194

CVE-2026-67194 affects Courier IMAP prior to 6.0.1 and Courier Mail Server prior to 2.0.2. The vulnerability lies in the SEARCH parser (alloc_search_key in searchinfo.C), which recursively descends through deeply nested parenthesized groups without a depth limit. A single IMAP command with ~2500 ...