Bug 2562330

Summary: CVE-2026-102486 ntpsec: ntpsec: Denial of Service via out-of-bounds read in NTS extension field parsing [fedora-all]
Product: [Fedora] Fedora Reporter: Oleg Sushchenko <osushche>
Component: ntpsecAssignee: Miroslav Lichvar <mlichvar>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: geert, igor.raits, mlichvar
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["c7510b22-a3bb-4130-ad89-c3e5e23478fb"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-29 07:43:37 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2558324    

Description Oleg Sushchenko 2026-10-27 18:56:11 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.

Out-of-bounds read in NTS extension field parsing in NTPsec ntpd 1.1.4 through 1.2.5 allows a remote attacker to crash the daemon via an NTS Authenticator and Encrypted Extension Fields (AEEF) field with an oversized nonce length.
Comment 1 Miroslav Lichvar 2026-10-29 07:43:37 UTC 
Fixed by:
https://bodhi.fedoraproject.org/updates/FEDORA-2026-cf1a6e2b9d
https://bodhi.fedoraproject.org/updates/FEDORA-2026-0c9e216697
https://bodhi.fedoraproject.org/updates/FEDORA-2026-7fb98d1c29
https://bodhi.fedoraproject.org/updates/FEDORA-2026-81589a14c2