Is there a patch available for CVE-2026-5123?

Yes, a patch is available for CVE-2026-5123. Update the affected software to the latest version immediately.

Gobgp CVE-2026-5123

Q: What is the CVSS score of CVE-2026-5123?

CVE-2026-5123 has a CVSS 4.0 base score of 6.3 (Medium). CVSS vector: 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 exploitation probability: 0.0%.

EUVD-2026-17109 MEDIUM

Off-by-one Error (CWE-193)

2026-03-30 VulDB

Information Disclosure Gobgp

6.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

6.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

EUVD ID Assigned

Mar 30, 2026 - 16:00 euvd

EUVD-2026-17109

Analysis Generated

Mar 30, 2026 - 16:00 vuln.today

Patch released

Mar 30, 2026 - 16:00 nvd

Patch available

CVE Published

Mar 30, 2026 - 15:15 nvd

MEDIUM 6.3

DescriptionCVE.org

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.

AnalysisAI

Denial of service in osrg GoBGP up to version 4.3.0 via off-by-one error in the DecodeFromBytes function allows remote, unauthenticated attackers to crash the BGP daemon through manipulation of packet data, resulting in availability impact. The vulnerability requires high attack complexity and has difficult exploitability; no public exploit code or active exploitation is currently confirmed, though a patch is available from the vendor.

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Vulnerability AssessmentAI

Risk Assessment	This vulnerability presents low-to-moderate real-world risk despite network-reachable attack vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker with network access to a GoBGP instance (either via direct BGP peering or if GoBGP is internet-exposed) sends a specially crafted BGP message with a malicious data[1] value that triggers the off-by-one boundary condition in DecodeFromBytes. This causes the GoBGP process to access memory beyond the intended buffer bounds, resulting in a segmentation fault or similar memory violation that crashes the BGP daemon and disrupts routing services. …
Remediation	Upgrade osrg GoBGP to a version incorporating commit 67c059413470df64bc20801c46f64058e88f800f or later. … Detailed patch versions, workarounds, and compensating controls in full report.