Allocation of Resources Without Limits or Throttling in Apache bRPC - CVE-2026-81755
Published: October 23, 2026
Vulnerability identifier: #VU157356
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-2026-81755
CWE-ID: CWE-770
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 exhausting server memory.
The vulnerability exists due to uncontrolled resource allocation in Apache bRPC's StreamAccept handling when creating a response stream for every identifier declared in a request without a per-request stream-count limit. A remote attacker can send a single RPC request containing an excessive number of stream_settings.extra_stream_ids to allocate large numbers of execution queues and associated resources and exhaust server memory.
Affected software
Apache bRPC
How to mitigate CVE-2026-81755
Install security update from vendor's website.
Apache bRPC - update to 1.18.0