CVE-2026-5124 osrg GoBGP BGP Header bgp.go BGPHeader.DecodeFromBytes access control
Remote attackers can bypass access controls in GoBGP's BGP header decoding, requiring high complexity and difficult exploitation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-5124?
CVE-2026-5124 is a medium-severity missing authorization vulnerability in osrg GoBGP, published on 30 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-5124?
It affects 1 product.
Products include Osrg Gobgp.
How do I fix CVE-2026-5124?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-5124 being exploited?
There is no known exploitation of CVE-2026-5124 in the wild and no public exploit code.
Other vulnerabilities in osrg GoBGP
- CVE-2025-43971 GoBGP panics due to a zero value for softwareVersionLen
- CVE-2026-41642 GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute
- CVE-2026-41643 GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE
- CVE-2026-42285 GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)
- CVE-2026-37461 GoBGP has an out-of-bounds read in the ParseIP6Extended function
Sources
Also known as DEBIAN-CVE-2026-5124, GHSA-688c-h9c2-ffwg, UBUNTU-CVE-2026-5124.