Vulnerability in Osrg Gobgp
CVE-2026-41643
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.
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 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% 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
Weakness classification (CWE)
References
- github.com/osrg/gobgp/releases/tag/v4.3.0 (Patch, Release Notes)
- github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-41643?
- CVE-2026-41643 is a high-severity vulnerability in Osrg Gobgp, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2026-05-07.
- How severe is CVE-2026-41643?
- High severity. CVSS v3 base score is 7.5 out of 10.