What’s Vulnerable › Vulnerabilities

CVE-2026-42285: GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-07 · updated 2026-10-26
• Weakness: CWE-476

Description

GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.4.0, an unauthenticated remote BGP peer can trigger a fatal panic in GoBGP by sending a specially crafted BGP UPDATE message. When the server receives a message with inconsistent attribute lengths, it improperly handles the internal state transition to a "withdraw" action, leading to a nil pointer dereference in the AdjRib.Update function. This causes the entire GoBGP process to crash, resulting in a complete loss of service availability. This issue has been patched in version 4.5.0.

Affected products

• osrg GoBGP: 4.4.0

References

• https://github.com/osrg/gobgp/releases/tag/v4.5.0
• https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j
• https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j

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