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CVE-2026-49838

GoBGP confederation validation panics on empty AS_PATH attribute PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
osrg / gobgpaffected < 4.7.0

CWE

CWE-129

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.