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CVE-2026-5124— osrg GoBGP BGP Header bgp.go BGPHeader.DecodeFromBytes access control

Quick assessment

Affected
osrg GoBGP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GoBGP是osrg开源的一种开源的边界网关协议（BGP）实现。 GoBGP 4.3.0及之前版本存在访问控制错误漏洞，该漏洞源于对文件pkg/packet/bgp/bgp.go中函数BGPHeader.DecodeFromBytes的错误操作，可能导致访问控制不当。

CVSS 3.7 · Low EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5124

Vulnerability Information
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Vulnerability Title
osrg GoBGP BGP Header bgp.go BGPHeader.DecodeFromBytes access control
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
GoBGP 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GoBGP是osrg开源的一种开源的边界网关协议（BGP）实现。 GoBGP 4.3.0及之前版本存在访问控制错误漏洞，该漏洞源于对文件pkg/packet/bgp/bgp.go中函数BGPHeader.DecodeFromBytes的错误操作，可能导致访问控制不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
osrg GoBGP 4.0 -

II. Public POCs for CVE-2026-5124

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III. Intelligence Information for CVE-2026-5124

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Patches & Fixes for CVE-2026-5124 (1)

Same Patch Batch · osrg · 2026-03-30 · 3 CVEs total

CVE-2026-5122 3.7 LOW osrg GoBGP BGP OPEN Message bgp.go DecodeFromBytes access control
CVE-2026-5123 3.7 LOW osrg GoBGP bgp.go DecodeFromBytes off-by-one

IV. Related Vulnerabilities

Same product: GoBGP
Same vendor: osrg
Same weakness: CWE-284

V. Comments for CVE-2026-5124

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