Interpretation Conflict in Apache bRPC - CVE-2026-84747
Published: October 23, 2026
Vulnerability identifier: #VU157364
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84747
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass front-proxy access controls and reach restricted bRPC resources.
The vulnerability exists due to inconsistent request-path interpretation in Apache bRPC's FindMethodPropertyByURI() when dispatching paths containing empty segments behind a proxy that applies access controls to literal paths. A remote attacker can send a path such as //flags?setvalue= that the proxy forwards but bRPC treats as the restricted /flags path to reach a resource the proxy intended to block.
Affected software
Apache bRPC
How to mitigate CVE-2026-84747
Install security update from vendor's website.
Apache bRPC - update to 1.18.0