Vulnerability · Published Oct 21, 2026 · Assigned by apache

CVE-2026-48830Apache bRPC: HTTP builtin request can mark a connection authenticated and bypass auth for later requests

Critical 9.1

In plain English

A critical-severity improper authentication in Apache bRPC from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.6%top 53.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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

Affected products (as reported)

Vendor	Product	Versions
Apache Software Foundation	Apache bRPC	0 – through 1.17.0

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb vendor-advisory