CVE-2026-27576CWE-400

OpenClaw: ACP prompt-size checks missing in local stdio bridge could reduce responsiveness with very large inputs

Medium · published February 21, 2026

CVSS v4.0
4.8
EPSS
0%
Percentile
9.2
In the wild
Unconfirmed
What it is

OpenClaw is a personal AI assistant. In versions 2026.2.17 and below, the ACP bridge accepts very large prompt text blocks and can assemble oversized prompt payloads before forwarding them to chat.send. Because ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs. This issue has been fixed in version 2026.2.19.

The record
Technical detail
CVSS v4.0
4.8 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00199 · 9.2th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-02-21T10:00Z
EPSS history
Timeline
  • 21 FEB 10:00Z
    OpenClaw: ACP prompt-size checks missing in local stdio bridge could reduce responsiveness with very large inputs
    cvelistv5