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OpenAdvisories
Critical RHSA-2026:19752 4 CVEs

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Published May 21, 2026 · Updated Oct 6, 2026

Ecosystem: Red Hat

Fixed packages 8

ReleasePackageFixed in
Red Hat · Hardened Images 1 hummingbird:1 python3-unbound 0:1.25.1-0.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 unbound 0:1.25.1-0.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 unbound-anchor 0:1.25.1-0.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 unbound-devel 0:1.25.1-0.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 unbound-dracut 0:1.25.1-0.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 unbound-libs 0:1.25.1-0.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 unbound-munin 0:1.25.1-0.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 unbound-utils 0:1.25.1-0.1.hum1

Vulnerabilities 4

  • Critical 9.1
    CVE-2026-33278

    Possible arbitrary code execution during DNSSEC validation

    NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and erroneously overwriting a destination p…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine
  • High 8.7
    CVE-2026-42944

    Heap overflow with multiple NSID, COOKIE, PADDING EDNS options

    NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', '…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine
  • High 8.7
    CVE-2026-42959

    Crash during DNSSEC validation of malicious content

    NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine
  • Medium 4.6
    CVE-2026-44608

    Use after free and crash under special conditions in RPZ code

    NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers) it could result in heap use-after-fre…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine

References

  • article
    https://images.redhat.com/
  • report
    https://access.redhat.com/security/cve/CVE-2026-42959
  • article
    https://access.redhat.com/security/updates/classification/
  • report
    https://access.redhat.com/security/cve/CVE-2026-33278
  • report
    https://access.redhat.com/security/cve/CVE-2026-42944
  • report
    https://access.redhat.com/security/cve/CVE-2026-44608
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_19752.json
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479808
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-33278
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-33278
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479774
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-42944
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-42944
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479806
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-42959
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-42959
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2480126
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-44608
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-44608
  • article
    https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt