Bug 2494156

Summary: CVE-2026-12413 libreswan: IKEv2 Denial of Service via malformed fragmentation [fedora-all]
Product: [Fedora] Fedora Reporter: TEJ RATHI <trathi>
Component: libreswanAssignee: Paul Wouters <paul.wouters>
Status: CLOSED CURRENTRELEASE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: 45CC: dueno, paul.wouters, shebburn
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---Flags: fedora-admin-xmlrpc: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["598ba4ff-758f-4b6a-b39c-94b5b04a3d31"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-08-25 19:48:30 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: 2494149    

Description TEJ RATHI 2026-06-29 11:38:44 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.

The Libreswan Project was notified of an issue when it receives an invalidly formatted IKEv2 fragment causing the server to crash and restart. A continued stream of such packets would cause a denial
of service.

Severity : Medium
Vulnerable versions : 4.6 - 5.3
Not vulnerable : 5.3.1 or later
Comment 1 Aoife Moloney 2026-08-17 15:01:42 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.
Comment 2 Paul Wouters 2026-08-25 19:48:30 UTC 
https://bodhi.fedoraproject.org/updates/FEDORA-2026-195b548c88