Vulnerability in Osrg Gobgp
CVE-2026-5123
A weakness has been identified in osrg GoBGP up to 4.3.0. This impacts the function DecodeFromBytes of the file pkg/packet/bgp/bgp.go. Executing a manipulation of the argument data[1] can lead to off-by-one. The attack may be launched remo…
EPSS: 0.001 (27.3th percentile) — read the EPSS interpretation.
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:N/A:L/E:X/RL:O/RC:C.
Affected products
- Osrg Gobgp — versions 4.0, 4.1, 4.2
Weakness classification (CWE)
References
- VDB-354155 | osrg GoBGP bgp.go DecodeFromBytes off-by-one (vdb-entry, technical-description)
- VDB-354155 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #780179 | osrg GoBGP 4.3.0 Off-by-one Error (third-party-advisory)
- github.com/osrg/gobgp/pull/3342 (issue-tracking, patch)
- github.com/osrg/gobgp/commit/67c059413470df64bc20801c46f64058e88f800f (patch)
- github.com/osrg/gobgp/ (product)
Frequently asked questions
- What is CVE-2026-5123?
- CVE-2026-5123 is a low-severity vulnerability in Osrg Gobgp, classified under Off-by-one Error. CVSS score: 3.7/10. Published 2026-03-30.
- How severe is CVE-2026-5123?
- Low severity. CVSS v3 base score is 3.7 out of 10.