CVE-2026-5122 MEDIUM

CVE-2026-5122: osrg GoBGP BGP OPEN Message bgp.go DecodeFromBytes access control

Vendor Osrg
Product GoBGP
Weakness CWE-284
Published March 30, 2026
Last update March 30, 2026
View on NVD All CVEs

CVSS base score

6.3/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 30, 2026 CVE published
March 30, 2026 Record updated