Bug 2481339 - CVE-2026-3039 dhcp: BIND 9 server memory exhaustion during GSS-API TKEY negotiation [fedora-all]
Summary: CVE-2026-3039 dhcp: BIND 9 server memory exhaustion during GSS-API TKEY negot...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: dhcp
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Martin Osvald 🛹
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["39a17c4f-3d14-45ff-8c77-7...
Depends On:
Blocks: CVE-2026-3039
TreeView+ depends on / blocked
 
Reported: 2026-05-26 03:46 UTC by Sandipan Roy
Modified: 2026-05-28 05:52 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2026-05-28 05:52:04 UTC
Type: ---
Embargoed:

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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).
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