{"cve":"CVE-2026-106454","nvd":{"published":"2026-10-06T20:17:27.597","modified":"2026-10-07T17:16:48.133","status":"Awaiting Analysis","description":"Twisted is an event-based framework for internet applications, supporting Python 3.6+. In 25.5.0 and earlier, wildcardToRegexp() in twisted/mail/imap4.py translates the IMAP asterisk and percent wildcards but passes all other characters from an authenticated client's LIST or LSUB pattern directly to re.compile(), allowing nested or otherwise expensive regular expression constructs to cause catastrophic backtracking when matched against mailbox names. Because Twisted uses a cooperative single-threaded reactor, the blocking match suspends all server input and output for the duration of the match. No fixed release is available as of this review.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","score":4.3},"cwes":["CWE-1333"],"references":["https://github.com/twisted/twisted/commit/2f8a3c29246f4eb324690e06a9767a11dc4aec9f","https://github.com/twisted/twisted/pull/12788","https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g","https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:01.639778232+00:00"},"epss":{"cve":"CVE-2026-106454","score":0.00417,"percentile":0.35664,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-8pqf-f4m5-798g","url":"https://osv.dev/vulnerability/GHSA-8pqf-f4m5-798g","summary":"Twisted: IMAP wildcardToRegexp() ReDoS","modified":"2026-10-15T14:56:15.526407507Z","packages":[{"ecosystem":"PyPI","name":"twisted","purl":"pkg:pypi/twisted","ranges":["<=26.4.0"],"fixed":[]}]},{"id":"PYSEC-2026-4304","url":"https://osv.dev/vulnerability/PYSEC-2026-4304","summary":"Twisted: IMAP wildcardToRegexp() ReDoS","modified":"2026-10-15T14:45:14.195795588Z","packages":[{"ecosystem":"PyPI","name":"twisted","purl":"pkg:pypi/twisted","ranges":["<=25.5.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}