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…

在 GitHub Advisory Database 阅读

2026/10/24 05:46，GitHub Advisory Database 发布了“Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCH”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：Python。CVE：CVE-2026-115774。