NULL pointer dereference in Osrg Gobgp
CVE-2026-41642
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as "Well-known," the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic). This issue has been patched in version 4.4.0.
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: 0.005 (42.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.7% 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: 0.005 · change: -0.001
Affected products
- Osrg Gobgp — versions 4.3.0, = 4.3.0
Weakness classification (CWE)
References
- github.com/osrg/gobgp/releases/tag/v4.4.0 (Product, Patch)
- github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41642?
- CVE-2026-41642 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-2026-41642?
- High severity. CVSS v3 base score is 7.5 out of 10.