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CVE-2026-5123— osrg GoBGP bgp.go DecodeFromBytes off-by-one

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。 osrg GoBGP 4.3.0及之前版本存在安全漏洞，该漏洞源于对文件pkg/packet/bgp/bgp.go中参数data[1]的错误操作，可能导致差一错误。

CVSS 3.7 · Low EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5123

Vulnerability Information
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Vulnerability Title
osrg GoBGP bgp.go DecodeFromBytes off-by-one
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
GoBGP 安全漏洞
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。 osrg GoBGP 4.3.0及之前版本存在安全漏洞，该漏洞源于对文件pkg/packet/bgp/bgp.go中参数data[1]的错误操作，可能导致差一错误。
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-2026-5123

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III. Intelligence Information for CVE-2026-5123

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Patches & Fixes for CVE-2026-5123 (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-2026-5124 3.7 LOW osrg GoBGP BGP Header bgp.go BGPHeader.DecodeFromBytes access control

IV. Related Vulnerabilities

Same product: GoBGP
Same vendor: osrg
Same weakness: CWE-193

V. Comments for CVE-2026-5123

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