CVE-2026-106454

MEDIUM 4.3

Twisted: IMAP wildcardToRegexp() ReDoS

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1333
Vendor	twisted
Product	twisted
Published	Oct 6, 2026

Stay Ahead of the Next One

Get instant alerts for twisted twisted

Be the first to know when new medium vulnerabilities affecting twisted twisted are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

twisted / twisted

<= 25.5.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g github.com: https://github.com/twisted/twisted/pull/12788 github.com: https://github.com/twisted/twisted/commit/2f8a3c29246f4eb324690e06a9767a11dc4aec9f