CVE-2026-100555 OpenClaw CVE debrief

Who should care

Defenders responsible for OpenClaw and Synology Chat deployments should assess exposure and prioritize patching to version 2026.8.1 or later. They should also review NAS routing and resolver behavior to understand potential impact and consider disabling remote URL attachment forwarding as a temporary measure. Security teams and vulnerability management teams should verify affected product deployments and plan for updates or mitigations.

Why it matters

Defenders should care about CVE-2026-100555 because it allows for server-side request forgery in OpenClaw and Synology Chat deployments, potentially leading to data exposure or unauthorized access. Patching to version 2026.8.1 or later is recommended, and defenders should verify NAS routing and resolver behavior to understand potential impact.

• Potential data exposure due to server-side request forgery
• Possible unauthorized access to private resources
• Required verification of NAS routing and resolver behavior
• Need for patching or workarounds to prevent exploitation

Technical summary

The OpenClaw gateway application, in versions >= 2026.7.1 and < 2026.8.1, had a vulnerability where Synology Chat attachment delivery could lose DNS pinning. An attacker could exploit this by using DNS rebinding to make the NAS fetch a private or policy-denied resource and return its contents to the addressed conversation, resulting in server-side request forgery. This issue allows for potential data exposure or unauthorized access. Practical impact depends on NAS routing, resolver behavior, and the response available at the private destination.

Defensive priority

Defenders should prioritize patching to version 2026.8.1 or later and consider disabling remote URL attachment forwarding as a temporary measure.

Recommended defensive actions

• Patch OpenClaw to version 2026.8.1 or later
• Disable remote URL attachment forwarding in Synology Chat as a temporary measure
• Review NAS routing and resolver behavior to understand potential impact
• Verify affected product deployments exist in managed environments
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability was reported by Vulncheck and is described in their advisory. The CVE Program and NVD have also published records on this vulnerability. Defenders should verify NAS routing and resolver behavior to understand potential impact and review compensating controls for exposed systems. Affected product deployments should be identified and assessed for exposure.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.