CVE-2026-42285: gobgp Null Dereference

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.39%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
osrg	gobgp	All

References

Advisories & Patches

https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j

Exploits

https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j

Other References

https://github.com/osrg/gobgp/releases/tag/v4.5.0

Frequently Asked Questions

What is CVE-2026-42285? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-42285? +

CVE-2026-42285 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42285? +

CVE-2026-42285 affects products from osrg, specifically: gobgp. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42285? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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