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CVE-2026-49838

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-49838

Severity

5.9

Medium

CVSS V3

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Summary

GoBGP confederation validation panics on empty AS_PATH attribute

Description

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.

References

Affected packages

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