NULL pointer dereference in Apache bRPC - CVE-2026-90484
Published: October 23, 2026
Vulnerability identifier: #VU157370
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-2026-90484
CWE-ID: CWE-476
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 MySQL client.
The vulnerability exists due to a null pointer dereference in Apache bRPC's MysqlReply::ConsumePartialIOBuf when a zero-payload-length response passes the frame-length check but a subsequent five-byte fetch returns nullptr. A remote attacker can send a zero-length response packet from a malicious MySQL server, or inject one from an on-path position, to trigger an unchecked access to the response type byte and crash the client process.
Affected software
Apache bRPC
How to mitigate CVE-2026-90484
Install security update from vendor's website.
Apache bRPC - update to 1.18.0