UBUNTU-CVE-2026-11331

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    UBUNTU-CVE-2026-11331

    Published: 22 Jul 2026Last Modified: 17 Oct 2026
    Upstream:
    CVE-2026-11331

    Summary:

    Details: An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

    References: https://ubuntu.com/security/CVE-2026-11331, https://www.cve.org/CVERecord?id=CVE-2026-11331, https://kb.isc.org/docs/cve-2026-11331, https://ubuntu.com/security/notices/USN-8648-1, https://ubuntu.com/security/notices/USN-8929-1

    Affected packages

    Package

    Name: isc-dhcp

    Purl: pkg:deb/ubuntu/isc-dhcp?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.3.5-3ubuntu2
    4.3.5-3ubuntu3
    4.3.5-3ubuntu4
    4.3.5-3ubuntu5
    4.3.5-3ubuntu6
    4.3.5-3ubuntu7
    4.3.5-3ubuntu7.1
    4.3.5-3ubuntu7.2
    4.3.5-3ubuntu7.3
    4.3.5-3ubuntu7.4

    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-2026-11331 | CVE-DB