Bug 2453019 (CVE-2026-5122)

Summary:	CVE-2026-5122 github.com/osrg/gobgp: osrg GoBGP: Improper access controls via domainNameLen argument manipulation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	kshier, stcannon, teagle, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:	A flaw was found in osrg GoBGP. A remote attacker could exploit a vulnerability in the BGP OPEN Message Handler by manipulating the `domainNameLen` argument within the `DecodeFromBytes` function. This could lead to improper access controls, potentially allowing unauthorized access or modification of data. The attack is complex and difficult to exploit.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2453526
Bug Blocks:

Description OSIDB Bzimport 2026-03-30 15:02:16 UTC

A security flaw has been discovered in osrg GoBGP up to 4.3.0. This affects the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go of the component BGP OPEN Message Handler. Performing a manipulation of the argument domainNameLen results in improper access controls. The attack may be initiated remotely. A high degree of complexity is needed for the attack. The exploitability is reported as difficult. The patch is named 2b09db390a3d455808363c53e409afe6b1b86d2d. It is suggested to install a patch to address this issue.