UBUNTU-CVE-2026-106454

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    UBUNTU-CVE-2026-106454

    Published: 6 Oct 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-106454
    Aliases:
    USN-9000-1

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2026-106454, https://www.cve.org/CVERecord?id=CVE-2026-106454, https://github.com/twisted/twisted/security/advisories/GHSA-8pqf-f4m5-798g, https://github.com/twisted/twisted/pull/12788, https://ubuntu.com/security/notices/USN-9000-1

    Affected packages

    Package

    Name: twisted

    Purl: pkg:deb/ubuntu/twisted?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    13.0.0-1ubuntu1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-106454 | CVE-DB