CVE-2026-5124 Details
Description
A security vulnerability has been detected in osrg GoBGP up to 4.3.0. Affected is the function BGPHeader.DecodeFromBytes of the file pkg/packet/bgp/bgp.go of the component BGP Header Handler. The manipulation leads to improper access controls. Remote exploitation of the attack is possible. The attack is considered to have high complexity. The exploitability is told to be difficult. The identifier of the patch is f0f24a2a901cbf159260698211ab15c583ced131. To fix this issue, it is recommended to deploy a patch.
A vulnerability exists in osrg GoBGP versions prior to 4.3.0, specifically within the BGPHeader.DecodeFromBytes function in the BGP Header Handler component. The issue arises from improper input validation of the 16-byte BGP Marker field, which is not correctly checked against the requirement that all bytes must be set to 0xFF. This oversight allows BGP messages with arbitrary Marker values to be accepted as valid, potentially leading to issues with malformed or injected traffic on an established TCP session.
Users are advised to update to GoBGP version 4.3.1 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/osrg/gobgp/ | [email protected] | Product |
| https://github.com/osrg/gobgp/commit/f0f24a2a901cbf159260698211ab15c583ced131 | [email protected] | Patch |
| https://github.com/osrg/gobgp/pull/3340 | [email protected] | Issue Tracking |
| https://vuldb.com/submit/780189 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/vuln/354156 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/vuln/354156/cti | [email protected] | Permissions RequiredVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-266 | Incorrect Privilege Assignment | [email protected] |
| CWE-284 | Improper Access Control | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| osrg gobgp | < 4.4.0 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 6, 2026 | Initial Analysis | [email protected] |
| Mar 30, 2026 | New CVE Received | [email protected] |