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CVE-2026-115774

4.9 medium Published
NVD · CVE.org

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.mail.imap4.IMAP4Server reaches twisted.mail.imap4.parseNestedParens with a negative literal size in an authenticated SEARCH command after the client enters the selected mailbox state. The negative size moves the parser cursor below zero, and Python's negative indexing prevents the synchronous scanning loop from terminating. The loop freezes the single-threaded reactor, stopping other IMAP connections and any SMTP or POP3 services hosted in the same process until restart. This issue is fixed in version 26.10.0rc1.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-29 14:20
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-26 14:05
  3. StatusReceived → PublishedNVD modified 2026-10-23 20:14
  4. First seenCVSS 4.9NVD modified 2026-10-23 21:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 4