Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCH

影響: pip:Twisted <= 26.4.0 → 26.10.0rc1

An infinite-loop vulnerability (CWE-835) in the Twisted IMAP4 server lets an authenticated client freeze the whole process with one small command. twisted.mail.imap4.parseNestedParens reads an IMAP literal size with int() and never rejects a negative value. A negative size such as {-100} drives the parser cursor negative, and because a negative Python index wraps around the end of the string instead of raising, the scanning loop never terminates. It runs synchronously on the single-threaded rea…

GitHub Advisory Databaseで読む

2026/10/24 05:46、GitHub Advisory Databaseが「Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCH」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「警告」(medium) です。関連する技術: Python。CVE: CVE-2026-115774。