RHSA-2026:55841: Important: unbound security update

Published Aug 17, 2026
·
Updated

Important: unbound security update

Other sources

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. Security Fix(es): unbound: Unbound: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes (CVE-2026-44690) unbound: Unbound: Denial of Service via malformed EDNS Report-Channel option (CVE-2026-55973) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

— Red Hat

Affected Software

60 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for IBM z Systems
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat CodeReady Linux Builder for ARM 64
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat CodeReady Linux Builder for Power, little endian
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Red Hat Enterprise Linux for Power, little endian
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64
Red Hat Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Red Hat Enterprise Linux for x86_64
Red Hat Red Hat Enterprise Linux for IBM z Systems - 4 years of updates
Red Hat Red Hat CodeReady Linux Builder for x86_64
Red Hat Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
redhat/unbound<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/python3-unbound<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/python3-unbound-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/python3-unbound-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-debugsource<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-debugsource<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-dracut<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-libs<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-libs<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-libs-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-libs-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/python3-unbound<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-dracut<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/python3-unbound<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/python3-unbound-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-debugsource<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-dracut<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-libs<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-libs-debuginfo<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/python3-unbound<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/python3-unbound-debuginfo<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/unbound<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/unbound-debuginfo<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/unbound-debugsource<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/unbound-dracut<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/unbound-libs<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/unbound-libs-debuginfo<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa
redhat/unbound-devel<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-devel<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-devel<1.24.2-3.el9_8.4
1.24.2-3.el9_8.4
redhat/unbound-devel<1.24.2-3.el9_8.4.aa
1.24.2-3.el9_8.4.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/unbound to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  2. Upgrade

    Upgrade redhat/python3-unbound to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  3. Upgrade

    Upgrade redhat/python3-unbound-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  4. Upgrade

    Upgrade redhat/unbound-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  5. Upgrade

    Upgrade redhat/unbound-debugsource to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  6. Upgrade

    Upgrade redhat/unbound-dracut to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  7. Upgrade

    Upgrade redhat/unbound-libs to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  8. Upgrade

    Upgrade redhat/unbound-libs-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  9. Upgrade

    Upgrade redhat/python3-unbound to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  10. Upgrade

    Upgrade redhat/python3-unbound-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  11. Upgrade

    Upgrade redhat/unbound to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  12. Upgrade

    Upgrade redhat/unbound-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  13. Upgrade

    Upgrade redhat/unbound-debugsource to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  14. Upgrade

    Upgrade redhat/unbound-dracut to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  15. Upgrade

    Upgrade redhat/unbound-libs to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  16. Upgrade

    Upgrade redhat/unbound-libs-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  17. Upgrade

    Upgrade redhat/unbound-devel to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4
  18. Upgrade

    Upgrade redhat/unbound-devel to a version that resolves this vulnerability.

    Fixed in 1.24.2-3.el9_8.4.aa
  19. Upgrade

    Upgrade unbound to a version that resolves this vulnerability.

    Patch CVE-2026-44690
  20. Upgrade

    Upgrade unbound to a version that resolves this vulnerability.

    Patch CVE-2026-55973

Event History

Aug 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·07:05 PM
Data Sourced
via Red Hat·07:05 PM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:55841?

The severity of RHSA-2026:55841 is classified as high.

2

What vulnerabilities are addressed in RHSA-2026:55841?

RHSA-2026:55841 addresses vulnerabilities related to cache poisoning and Denial of Service in the Unbound DNS resolver.

3

How do I fix RHSA-2026:55841?

To fix RHSA-2026:55841, you should apply the latest security updates for the Unbound packages.

4

What is the impact of CVE-2026-44690 mentioned in RHSA-2026:55841?

CVE-2026-44690 could lead to cache poisoning due to insufficient RRSIG.Labels validation and premature cache writes.

5

Which software does RHSA-2026:55841 affect?

RHSA-2026:55841 affects various Unbound packages including redhat/unbound and its related libraries.

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