Out-of-bounds read in Apache bRPC - CVE-2026-87849
Published: October 23, 2026
Vulnerability identifier: #VU157369
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-2026-87849
CWE-ID: CWE-125
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 potentially crashing a bRPC client.
The vulnerability exists due to an out-of-bounds read in Apache bRPC's Discovery naming-service reply parser when RapidJSON object-only accessors are called on values without verifying that they are objects. A remote attacker can return a malformed /discovery/nodes or /discovery/fetchs response from a malicious Discovery backend containing non-object data, service, or instance entries to trigger undefined member-access behavior and potentially crash clients refreshing their server lists.
Affected software
Apache bRPC
How to mitigate CVE-2026-87849
Install security update from vendor's website.
Apache bRPC - update to 1.18.0