CVE-2026-5122

low-risk
Published 2026-03-30

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.

Do I need to act?

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0.05% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.7/10 Low
NETWORK / HIGH complexity

Affected Products (1)

Gobgp

Affected Vendors

Osrg

References (6)

Product https://github.com/osrg/gobgp/
Patch https://github.com/osrg/gobgp/commit/2b09db390a3d455808363c53e409afe6b1b86d2d
Issue Tracking https://github.com/osrg/gobgp/pull/3343
Third Party Advisory https://vuldb.com/submit/780124
Third Party Advisory https://vuldb.com/vuln/354154
Permissions Required https://vuldb.com/vuln/354154/cti
18
/ 100
low-risk
Severity 13/34 · Low
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal