CVE-2026-5124: A security vulnerability has been detected in osrg GoBGP up to 4.3.0

Q: How do I fix CVE-2026-5124?

gobgp: upgrade to 4.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-5124 being exploited?

CVE-2026-5124 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-5124 affect?

CVE-2026-5124 affects gobgp. Severity is low (CVSS 3.7). 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 contro

Q: How urgent is CVE-2026-5124?

Priority 24/100. Remotely exploitable, no login, no user action

Routine

LOW 3.7REMOTEUPGRADE

CVE-2026-5124 is a low-severity flaw (CVSS 3.7) affecting gobgp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 f0f24a2a901cbf159260698211ab15c583

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-266, CWE-284
Published	2026-03-30
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: osrg

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-30 17:16 UTCPublished CVE record published
2026-06-17 10:58 UTCUpdated Record last modified

osrg gobgp UPGRADE

Affected: < 4.4.0

Fixed in: 4.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gobgp || rpm -q gobgp || gobgp --version

2. UPGRADE to 4.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gobgp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gobgp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-5124?

gobgp: upgrade to 4.4.0. Exact commands for each OS are on this page.

Is CVE-2026-5124 being exploited?

CVE-2026-5124 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-5124 affect?

CVE-2026-5124 affects gobgp. Severity is low (CVSS 3.7). 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 contro

How urgent is CVE-2026-5124?

Priority 24/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-41642 HIGH 7.5 DOWNGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-42285 HIGH 7.5 DOWNGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-41643 HIGH 7.5 UPGRADE GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language
CVE-2026-7736 HIGH 7.3 UPGRADE A vulnerability was determined in osrg GoBGP up to 4.3.0
CVE-2026-7735 HIGH 7.3 UPGRADE A vulnerability was found in osrg GoBGP up to 4.3.0

References

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