CVE-2026-27576 PUBLISHED

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

Assigner: GitHub_M
Reserved: 20.02.2026 Published: 21.02.2026 Updated: 21.02.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 4.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	openclaw
Product	openclaw
Versions	Version < 2026.2.19 is affected

References

Problem Types

CWE-400: Uncontrolled Resource Consumption CWE