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CVE-2026-49837 is a boundary validation flaw in GoBGP's parsing of BGP OPEN capabilities. The vulnerability affects the capability parser in github.com/osrg/gobgp/v4, where concrete capability decoders may read capability values beyond the declared capability length (CapLen) boundary. As a result, a malformed BGP OPEN message can cause the parser to consume bytes from subsequent capability fields as though they belonged to the current capability value. In the case of the 4-octet AS capability, this can interfere with peer AS validation and capability negotiation logic during BGP session establishment.
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