PT-2026-37259 · Gobgp · Gobgp

Bacon251 · Published 2026-05-05 · Updated 2026-05-07 · CVE-2026-42285

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions GoBGP versions prior to 4.5.0

Description An unauthenticated remote BGP peer can cause a fatal panic and complete loss of service availability 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. This leads to a nil pointer dereference—a situation where the software attempts to access a memory location that does not exist—within the AdjRib.Update() function. The issue originates from the interaction between the BGP message decoding logic and the Adj-RIB table management, specifically when the handleUpdate function processes malformed attributes.

Recommendations Update to version 4.5.0.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-42285

GHSA-P3W2-64XM-833J

Affected Products

Gobgp

References · 12

• 🔥 https://github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j · Exploit
• https://osv.dev/vulnerability/GHSA-p3w2-64xm-833j · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42285 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42285 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-42285 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-42285 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-42285 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-42285 · Security Note
• https://github.com/osrg/gobgp/releases/tag/v4.5.0 · Note
• https://github.com/osrg/gobgp · Note
• https://t.me/cveNotify/162506 · Telegram Post
• https://twitter.com/CVEnew/status/2052400777004728590 · Twitter Post