What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-30 · updated 2026-06-17
• Weakness: CWE-266

Description

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.

Affected products

• osrg GoBGP: before 4.4.0 — fixed in 4.4.0

How to fix

Upgrade to a fixed version: osrg GoBGP 4.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/osrg/gobgp/
• https://github.com/osrg/gobgp/commit/2b09db390a3d455808363c53e409afe6b1b86d2d
• https://github.com/osrg/gobgp/pull/3343
• https://vuldb.com/submit/780124
• https://vuldb.com/vuln/354154
• https://vuldb.com/vuln/354154/cti

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