# CVE-2026-5123

## Summary

- **CVE ID:** CVE-2026-5123
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X)
- **CWE:** CWE-193, CWE-189
- **Published:** Mar 30, 2026
- **Last Modified:** Mar 30, 2026

## Description

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.

## Affected Products

- osrg — GoBGP (4.0)
- osrg — GoBGP (4.1)
- osrg — GoBGP (4.2)
- osrg — GoBGP (4.3.0)

## References

- [CNA](https://vuldb.com/vuln/354155)
- [CNA](https://vuldb.com/vuln/354155/cti)
- [CNA](https://vuldb.com/submit/780179)
- [CNA](https://github.com/osrg/gobgp/pull/3342)
- [CNA](https://github.com/osrg/gobgp/commit/67c059413470df64bc20801c46f64058e88f800f)
- [CNA](https://github.com/osrg/gobgp/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.41%
- **EPSS Percentile:** 34.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._