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CVE-2026-49838 is a denial-of-service vulnerability in GoBGP affecting BGP UPDATE processing for confederation validation. When handling an UPDATE from a confederation eBGP neighbor, the implementation accesses the first element of the AS_PATH attribute without first verifying that the attribute contains any entries. A malformed UPDATE carrying a zero-length AS_PATH can therefore trigger a panic during validation instead of being rejected as invalid input. The issue is caused by improper handling of exceptional input conditions in AS_PATH parsing and validation logic.
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