CVE-2026-48830 is a vulnerability in Apache Brpc
Published on October 21, 2026
Apache bRPC: HTTP builtin request can mark a connection authenticated and bypass auth for later requests
Improper authentication in Apache bRPC through 1.17.0 allows a remote unauthenticated attacker to bypass authentication for protected non-builtin HTTP endpoints by first sending a builtin HTTP request on the same HTTP/1.1 keep-alive connection.
When ServerOptions.auth is enabled and builtin HTTP services are exposed on the public listener, a builtin request received as the first message on a socket may cause the connection to be treated as authenticated for later requests on that socket. Users are recommended to upgrade to version 1.18.0, which fixes this issue, or apply this PR separately: https://github.com/apache/brpc/pull/3308
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-48830 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-48830
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Affected Versions
Apache Software Foundation Apache bRPC:- Before and including 1.17.0 is affected.
- Version 1.18.0 is unaffected.