High severity · published May 7, 2026
CVE-2026-42285
GoBGP: Panic in AdjRib.Update via malformed BGP Update message (Nil Pointer Dereference)
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GO
gobgp · osrg
= 4.4.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42285
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42285
Product
https://github.com/osrg/gobgp/releases/tag/v4.5.0
Exploit
https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j
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