Out-of-bounds write in Apache bRPC - CVE-2026-56388
Published: October 23, 2026
Vulnerability identifier: #VU157342
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56388
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by crashing a bRPC Redis server process.
The vulnerability exists due to an out-of-bounds write in Apache bRPC's RedisCommandParser::ConsumeImpl when an empty RESP command array is accepted and parsing continues into a subsequent bulk string. A remote attacker can send an empty array header followed by a bulk string to trigger a write to _args[0] in an empty argument vector and crash the process.
Affected software
Apache bRPC
How to mitigate CVE-2026-56388
Install security update from vendor's website.
Apache bRPC - update to 1.18.0