Bug 2535059 (CVE-2026-81642) - CVE-2026-81642 unbound: Unbound: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY
Summary: CVE-2026-81642 unbound: Unbound: Heap buffer overflow and possible Remote Cod...
Keywords:
Status: NEW
Alias: CVE-2026-81642
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2536324
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-16 09:07 UTC by OSIDB Bzimport
Modified: 2026-10-18 08:43 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:70754 0 None None None 2026-09-23 13:22:30 UTC
Red Hat Product Errata RHSA-2026:71419 0 None None None 2026-09-24 09:07:20 UTC
Red Hat Product Errata RHSA-2026:71459 0 None None None 2026-09-24 08:46:19 UTC
Red Hat Product Errata RHSA-2026:71460 0 None None None 2026-09-24 10:58:58 UTC
Red Hat Product Errata RHSA-2026:71487 0 None None None 2026-09-24 16:39:19 UTC
Red Hat Product Errata RHSA-2026:71610 0 None None None 2026-09-24 15:24:29 UTC
Red Hat Product Errata RHSA-2026:71611 0 None None None 2026-09-24 15:39:20 UTC
Red Hat Product Errata RHSA-2026:72110 0 None None None 2026-09-25 19:24:28 UTC
Red Hat Product Errata RHSA-2026:72183 0 None None None 2026-09-25 22:16:28 UTC
Red Hat Product Errata RHSA-2026:72199 0 None None None 2026-09-26 17:35:35 UTC
Red Hat Product Errata RHSA-2026:72264 0 None None None 2026-09-27 18:35:50 UTC

Description OSIDB Bzimport 2026-09-16 09:07:56 UTC 
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.
Comment 2 Jon Orris 2026-09-23 13:22:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:70754 https://access.redhat.com/errata/RHSA-2026:70754
Comment 3 Jon Orris 2026-09-23 13:22:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:70754 https://access.redhat.com/errata/RHSA-2026:70754
Comment 4 Jon Orris 2026-09-24 08:46:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:71459 https://access.redhat.com/errata/RHSA-2026:71459
Comment 5 Jon Orris 2026-09-24 09:07:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:71419 https://access.redhat.com/errata/RHSA-2026:71419
Comment 6 Jon Orris 2026-09-24 10:58:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:71460 https://access.redhat.com/errata/RHSA-2026:71460
Comment 7 Jon Orris 2026-09-24 15:24:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:71610 https://access.redhat.com/errata/RHSA-2026:71610
Comment 8 Jon Orris 2026-09-24 15:39:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:71611 https://access.redhat.com/errata/RHSA-2026:71611
Comment 9 Jon Orris 2026-09-24 16:39:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:71487 https://access.redhat.com/errata/RHSA-2026:71487
Comment 10 Jon Orris 2026-09-25 19:24:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:72110 https://access.redhat.com/errata/RHSA-2026:72110
Comment 11 Jon Orris 2026-09-25 22:16:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:72183 https://access.redhat.com/errata/RHSA-2026:72183
Comment 12 Jon Orris 2026-09-26 17:35:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:72199 https://access.redhat.com/errata/RHSA-2026:72199
Comment 13 Jon Orris 2026-09-27 18:35:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:72264 https://access.redhat.com/errata/RHSA-2026:72264
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