CVE-2026-5123

Name: CVE-2026-5123
Creator: NVD / NIST
Published: 2026-03-30T16:16:10.123+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 0.41%

Last modified Jun 17, 2026

CVE-2026-5123 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. 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. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.7/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS 4.0

6.3/10

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.41%

32.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Osrg	Gobgp	< 4.4.0

References

https://github.com/osrg/gobgp/Product
https://github.com/osrg/gobgp/commit/67c059413470df64bc20801c46f64058e88f800fPatch
https://github.com/osrg/gobgp/pull/3342Issue Tracking
https://vuldb.com/submit/780179Third Party Advisory, VDB Entry
https://vuldb.com/vuln/354155Third Party Advisory, VDB Entry
https://vuldb.com/vuln/354155/ctiPermissions Required, VDB Entry

Timeline

Published: Mar 30, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-5123?

How severe is CVE-2026-5123?

CVE-2026-5123 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2026-5123?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-5123?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST