Out-of-bounds read in Apache bRPC - CVE-2026-79704
Published: October 23, 2026
Vulnerability identifier: #VU157354
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-79704
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to crash a bRPC client or potentially expose unintended memory contents during stream handling.
The vulnerability exists due to an out-of-bounds read in Apache bRPC's multi-stream RPC response handling when the returned extra_stream_ids list is shorter than the number of additional locally created streams. A remote attacker can return a malformed StreamSettings response from a malicious server, or modify the response from an on-path position, to trigger unchecked list indexing and potentially crash the client or leak memory into subsequent stream handling.
Affected software
Apache bRPC
How to mitigate CVE-2026-79704
Install security update from vendor's website.
Apache bRPC - update to 1.18.0