CVE intelligence

CVE-2026-106454

Vulnerability intelligence

Published Oct 6, 2026Sources checked Oct 21, 2026

4.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-106454 and is rated Medium severity with a CVSS score of 4.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Oct 14, 2026

Release Notes

Vendor-listed releases

22.10.0-7

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-106454?

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.

Source: NVD