Privilege escalation in Osrg Gobgp
CVE-2026-5122
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.003 · change: -0.002
Affected products
- Osrg Gobgp — versions 4.0, 4.1, 4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/354154 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/354154/cti (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/submit/780124 (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/osrg/gobgp/pull/3343 (issue-tracking, patch, Issue Tracking)
- github.com/osrg/gobgp/commit/2b09db390a3d455808363c53e409afe6b1b86d2d (Patch, patch)
- github.com/osrg/gobgp/ (Product, product)
Frequently asked questions
- What is CVE-2026-5122?
- CVE-2026-5122 is a low-severity vulnerability in Osrg Gobgp, classified under Incorrect Privilege Assignment. CVSS score: 3.7/10. Published 2026-03-30.
- How severe is CVE-2026-5122?
- Low severity. CVSS v3 base score is 3.7 out of 10.