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 remotely. Attacks of this nature are highly complex. The exploitability is said to be difficult. This patch is called 67c059413470df64bc20801c46f64058e88f800f. A patch should be applied to remediate 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:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (34.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.004 · change: -0.003
Affected products
- Osrg Gobgp — versions 4.0, 4.1, 4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/354155 (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/vuln/354155/cti (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/submit/780179 (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/osrg/gobgp/pull/3342 (issue-tracking, patch, Issue Tracking)
- github.com/osrg/gobgp/commit/67c059413470df64bc20801c46f64058e88f800f (Patch, patch)
- github.com/osrg/gobgp/ (Product, product)
Frequently asked questions
- What is CVE-2026-5123?
- CVE-2026-5123 is a low-severity vulnerability in Osrg Gobgp, classified under CWE-189. 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.