External Control of File Name or Path in Apache bRPC - CVE-2026-86147
Published: October 23, 2026
Vulnerability identifier: #VU157367
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-86147
CWE-ID: CWE-73
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to create directories, truncate or overwrite files with the server process's privileges, or monopolize process-wide profiling resources.
The vulnerability exists due to external control of file paths and uncontrolled resource consumption in Apache bRPC's builtin /flags and /pprof services when accepting runtime dump-path changes or unbounded profiling durations. A remote attacker can change dump-path flags and enable dumping, use '..' in dump tab names, or request ?seconds=2147483647 to write to attacker-chosen file locations or hold the CPU or contention profiler for an arbitrarily long time.
Affected software
Apache bRPC
How to mitigate CVE-2026-86147
Install security update from vendor's website.
Apache bRPC - update to 1.18.0