Improper Validation of Array Index Affecting github.com/osrg/gobgp/v4/packet/bgp package, versions <4.7.0
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMOSRGGOBGPV4PACKETBGP-17934833
- published10 Jul 2026
- disclosed9 Jul 2026
- creditUnknown
Introduced: 9 Jul 2026
CVE-2026-49838 Â (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade github.com/osrg/gobgp/v4/packet/bgp to version 4.7.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Array Index in the validation process for BGP UPDATE messages containing an empty AS_PATH attribute. An attacker can cause a panic and terminate the peer session by sending a malformed UPDATE with a zero-length AS_PATH to a configured confederation eBGP neighbor. This is only exploitable if the peer is configured as a confederation eBGP neighbor.