Bug 2481339

Summary: CVE-2026-3039 dhcp: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
Product: [Fedora] Fedora Reporter: Sandipan Roy <saroy>
Component: dhcpAssignee: Martin Osvald 🛹 <mosvald>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: fhrdina, jorton, mosvald, pavel, pemensik
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["39a17c4f-3d14-45ff-8c77-76b4e32e2e7a"]}
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Last Closed: 2026-05-28 05:52:04 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2479767    

Description Sandipan Roy 2026-05-26 03:46:27 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Comment 1 Martin Osvald 🛹 2026-05-28 05:52:04 UTC 
ISC DHCP is not affected. This is a BIND server-side issue.

The ISC DHCP server does not natively support GSS-API TKEY negotiation / GSS-TSIG for DDNS updates.

It supports standard TSIG-based DDNS updates to DNS servers like BIND, but not Kerberos/GSS-TSIG negotiation used commonly with Microsoft Active Directory secure DNS updates.

ISC DHCP uses portions of the ISC BIND libraries (primarily libdns, omapi, and libisccfg) only to support DDNS (TSIG support, DNS message construction/parsing, DHCID generation), OMAPI related operations, basic functions (configuration handling, data structures, logging, networking primitives).