CVE-2026-49838

Summary

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 Software

VendorProductVersion RangeStatus
osrggobgp< 4.7.0affected

Weaknesses

  • CWE-129: CWE-129: Improper Validation of Array Index

References