CVE-2026-41351: OpenClaw Telnyx Webhook Replay Detection Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-37v6-fxx8-xjmx
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CVSS 5.3
CWE-294
Published
Advisory Summary

CVE-2026-41351 is a MODERATE (CVSS 5.3) telnyx webhook replay detection bypass vulnerability (CWE-294: Authentication Bypass by Capture-replay) affecting OpenClaw libraries in the npm ecosystem. The issue involves telnyx webhook replay detection bypass via base64 signature re-encoding. Remediation is available by upgrading affected packages to version 2026.3.31.

CVE-2026-41351 at a Glance

CVE Identifier CVE-2026-41351
GHSA Identifier GHSA-37v6-fxx8-xjmx
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-294: Authentication Bypass by Capture-replay
Affected Product OpenClaw
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-41351

To remediate this vulnerability, upgrade all affected OpenClaw dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

openclaw fixed: 2026.3.31 
npm install openclaw@2026.3.31
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls openclaw

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-41351, inspect your project dependencies using npm:

npm ls openclaw

Analyze the terminal output to locate any version of OpenClaw in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2026.3.31), your application is affected.

Note: The npm ls openclaw command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-294: Authentication Bypass by Capture-replay, where a capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). In OpenClaw, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Summary Telnyx Webhook Replay Detection Bypass via Base64 Signature Re-encoding ## Current Maintainer Triage - Status: narrow - Normalized severity: low - Assessment: Shipped v2026.3.28 replay hashing treated equivalent Telnyx Base64/Base64URL signatures as distinct requests, but signature verification still held, so lower to low. ## Affected Packages / Versions - Package: `openclaw` (npm) - Latest published npm version: `2026.3.31` - Vulnerable version range: `<=2026.3.28` - Patched versions: `>= 2026.3.31` - First stable tag containing the fix: `v2026.3.31` ## Fix Commit(s) - `ad77666054651c1fd77b1dc60fd6a8db6600a29a` — 2026-03-30T20:01:43+01:00 ## Release Process Note - The fix is already present in released version `2026.3.31`. - This draft looks ready for final maintainer disposition or publication, not additional code-fix work. OpenClaw thanks @AntAISecurityLab for reporting.

CVE-2026-41351 Affected OpenClaw Versions

1 component(s)
Fixed Versions:
2026.3.31
Product / Package Ecosystem Affected Versions Fixed Version
openclaw
npm/openclaw
npm
< 2026.3.31
2026.3.31

References

GitHub Advisory / Wiki ADVISORY
https://github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx
NVD — CVE-2026-41351 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41351
Security Fix Commit FIX COMMIT
https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a
OpenClaw Source Repository REPOSITORY
https://github.com/openclaw/openclaw
OpenClaw Release RELEASE
https://github.com/openclaw/openclaw/releases/tag/v2026.3.31
www.vulncheck.com/advisories/openclaw... WEB
https://www.vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding

Frequently Asked Questions

What is CVE-2026-41351?
CVE-2026-41351 is a security vulnerability in OpenClaw involving Telnyx Webhook Replay Detection Bypass via Base64 Signature Re-encoding under CWE-294: Authentication Bypass by Capture-replay.
Which OpenClaw versions are affected?
Affected versions include releases prior to 2026.3.31 across affected packages: openclaw.
What version fixes CVE-2026-41351?
Upgrading to 2026.3.31 (or the latest patched release for your respective branch) resolves the vulnerability.
Is openclaw affected?
Yes, openclaw is affected in releases prior to 2026.3.31. Upgrade your dependency to 2026.3.31 or later.
What is the CVSS score of CVE-2026-41351?
CVE-2026-41351 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-41351?
CVE-2026-41351 is classified under CWE-294: Authentication Bypass by Capture-replay (A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).).
How can I check npm dependencies for CVE-2026-41351?
Run the dependency tree command: 'npm ls openclaw'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-37v6-fxx8-xjmx",
  "modified" : "2026-05-06T23:25:13Z",
  "published" : "2026-04-03T02:58:17Z",
  "aliases" : [ "CVE-2026-41351" ],
  "summary" : "OpenClaw: Telnyx Webhook Replay Detection Bypass via Base64 Signature Re-encoding",
  "details" : "## Summary\nTelnyx Webhook Replay Detection Bypass via Base64 Signature Re-encoding\n\n## Current Maintainer Triage\n- Status: narrow\n- Normalized severity: low\n- Assessment: Shipped v2026.3.28 replay hashing treated equivalent Telnyx Base64/Base64URL signatures as distinct requests, but signature verification still held, so lower to low.\n\n## Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Latest published npm version: `2026.3.31`\n- Vulnerable version range: `<=2026.3.28`\n- Patched versions: `>= 2026.3.31`\n- First stable tag containing the fix: `v2026.3.31`\n\n## Fix Commit(s)\n- `ad77666054651c1fd77b1dc60fd6a8db6600a29a` — 2026-03-30T20:01:43+01:00\n\n## Release Process Note\n- The fix is already present in released version `2026.3.31`.\n- This draft looks ready for final maintainer disposition or publication, not additional code-fix work.\n\nOpenClaw thanks @AntAISecurityLab for reporting.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "openclaw"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2026.3.31"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2026.3.28"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-41351"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/openclaw/openclaw"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/openclaw/openclaw/releases/tag/v2026.3.31"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-294" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-03T02:58:17Z",
    "nvd_published_at" : null
  }
}