CVE-2026-49838
GoBGP confederation validation panics on empty AS_PATH attribute
MEDIUM 5.9EPSS 0.4%
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.7.0, GoBGP accepts a zero-length AS_PATH during UPDATE decoding and later panics while validating that attribute for a confederation eBGP peer. The vulnerable path is in the BGP UPDATE validator: a malformed UPDATE that should be rejected as a malformed AS_PATH instead reaches an unchecked `p.Value[0]` access, allowing a configured confederation eBGP peer to trigger a denial of service. Version 4.7.0 patches the issue.
- Affected
- osrg · gobgp
- CVSS v3.1 GITHUB
- 5.9 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 0.41% chance of exploitation in the next 30 days, 34th percentile
- Published
- 2026-09-10
- Updated
- 2026-09-11