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VulnerabilityPublished Updated

CVE-2026-41351: OpenClaw · Telnyx Webhook Replay Detection Bypass via Base64 Signature Re-encoding

Affects openclawSource GCVE Database

0

Not known to be exploited · CVSS 5.3 Medium : upgrade to 2026.3.31 when convenient.

Data as of 27 Oct 2026, 02:26 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 2026.3.31
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade openclaw to 2026.3.31.

Affected software

ProductAffectedFixed in
npmopenclawAffected
  • <2026.3.31
Fixed in
  • 2026.3.31

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade OpenClaw to version 2026.3.31 or later, where the replay detection logic correctly treats Base64 and Base64URL signatures equivalently, preventing bypass. The fix is already released and available. No additional action is required beyond applying this update.

Description

OpenClaw versions up to 2026.3.28 contain a vulnerability (CVE-2026-41351) that allows bypassing Telnyx webhook replay detection due to Base64 signature re-encoding issues. The flaw causes replay hashing to treat equivalent Telnyx Base64 and Base64URL signatures as distinct, enabling replay attacks despite signature verification still functioning. The issue is fixed in version 2026.3.31.

References

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