NULL pointer dereference in Osrg Gobgp
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (35.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.004 · change: -0.002
Affected products
- Osrg Gobgp — versions 4.4.0, = 4.4.0
Weakness classification (CWE)
References
- github.com/osrg/gobgp/releases/tag/v4.5.0 (Product, Release Notes)
- github.com/osrg/gobgp/security/advisories/GHSA-p3w2-64xm-833j (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42285?
- CVE-2026-42285 is a high-severity vulnerability in Osrg Gobgp, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-05-07.
- How severe is CVE-2026-42285?
- High severity. CVSS v3 base score is 7.5 out of 10.