UBUNTU-CVE-2026-19662

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    UBUNTU-CVE-2026-19662

    Published: 16 Sept 2026Last Modified: 3 Nov 2026
    Upstream:
    CVE-2026-19662
    Aliases:
    USN-8929-1

    Summary:

    Details: An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

    References: https://ubuntu.com/security/CVE-2026-19662, https://www.cve.org/CVERecord?id=CVE-2026-19662, https://kb.isc.org/docs/cve-2026-19662, https://ubuntu.com/security/notices/USN-8929-1, https://ubuntu.com/security/notices/USN-8969-1

    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-2026-19662 | CVE-DB