{"id":"CVE-2026-106454","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-106454","generatedAt":"2026-10-28T01:12:34.534Z","title":"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…","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.","published":"2026-10-06T20:17:28.000Z","lastModified":"2026-10-07T17:16:48.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},"cwe":["CWE-1333"],"affected":[],"epss":{"score":0.00417,"percentile":0.35695,"date":"2026-10-26","history":[{"date":"2026-10-07","score":0.0033,"percentile":0.24094}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-06T20:17:28.000Z","detail":{"score":"4.3","severity":"MEDIUM","publishedAt":"2026-10-06T20:17:27.597Z"},"summary":"New CVE, medium severity (CVSS 4.3)."}],"references":[{"url":"https://github.com/twisted/twisted/commit/2f8a3c29246f4eb324690e06a9767a11dc4aec9f","source":"security-advisories@github.com"},{"url":"https://github.com/twisted/twisted/pull/12788","source":"security-advisories@github.com"},{"url":"https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g","source":"security-advisories@github.com"},{"url":"https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-106454","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}