CVE-2026-35627Network attack vector

Service interruption via pre-policy Nostr decryption

Published Apr 9, 2026 · Updated Apr 9, 2026

Incorrect behavior order in OpenClaw before 2026.3.22 allows remote attackers to exhaust resources through crafted Nostr direct messages. The Nostr channel decrypts and dispatches inbound content before channel.ts enforces sender and pairing policy, while nostr-bus.ts lacks pre-crypto size and rate guards. No authentication or user interaction is required; unknown senders can force unbounded cryptographic work and interrupt the Gateway service.

CVSS severity6.9
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect behavior order in OpenClaw before 2026.3.22 allows remote attackers to exhaust resources through crafted Nostr direct messages. The Nostr channel decrypts and dispatches inbound content before channel.ts enforces sender and pairing policy, while nostr-bus.ts lacks pre-crypto size and rate guards. No authentication or user interaction is required; unknown senders can force unbounded cryptographic work and interrupt the Gateway service.

The record

CVE
CVE-2026-35627
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-696, CWE-863, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <2026.3.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.3.22

Published CVSS scores

8.6GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
8.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-696Incorrect Behavior Order
CWE-863Incorrect Authorization
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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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