CVE-2026-94094Public exploitNetwork attack vectorHinoki check available

Authenticated service interruption via unbounded file buffering

Published Sep 20, 2026 · Updated Sep 20, 2026

Denial of service in OpenClaw 2026.9.0 through 2026.9.5 allows remote authenticated users to interrupt the Gateway service. The Canvas document handler calls handle.readFile() without a size limit and retains the whole file buffer while res.end() serves it. Access to the Canvas Host route and a large hosted file lets multiple slow GET connections consume memory and event-loop capacity, making shared endpoints unavailable.

CVSS severityUnavailable
Unscored
EPSS probability0.47%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in OpenClaw 2026.9.0 through 2026.9.5 allows remote authenticated users to interrupt the Gateway service. The Canvas document handler calls handle.readFile() without a size limit and retains the whole file buffer while res.end() serves it. Access to the Canvas Host route and a large hosted file lets multiple slow GET connections consume memory and event-loop capacity, making shared endpoints unavailable.

The record

CVE
CVE-2026-94094
Published
Sep 20, 2026
Updated
Sep 20, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-404, T1499.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2026.9.0
  2. Affected versionversion=2026.9.1
  3. Affected versionversion=2026.9.2
  4. Affected versionversion=2026.9.3
  5. Affected versionversion=2026.9.4
  6. Affected versionversion=2026.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=2026.9.0; version=2026.9.1; version=2026.9.2; version=2026.9.3; version=2026.9.4; version=2026.9.5

Published CVSS scores

4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
4.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.002Service Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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