PT-2026-34782 · Openclaw · Openclaw

Antaisecuritylab · Published 2026-04-03 · Updated 2026-04-25 · CVE-2026-41351

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions OpenClaw versions prior to 2026.3.31

Description An issue exists in the webhook signature handling that treats Base64 and Base64URL encoded signatures as distinct requests. This allows attackers to re-encode Telnyx webhook signatures to bypass replay detection, which is a mechanism designed to prevent the same request from being processed multiple times, while still maintaining valid signature verification.

Recommendations Update to version 2026.3.31.

Fix

Weakness Enumeration

CWE-294

Related Identifiers

CVE-2026-41351

GHSA-37V6-FXX8-XJMX

GHSA-M958-864J-XQ5W

Affected Products

Openclaw

References · 9

• https://github.com/openclaw/openclaw/commit/ad77666054651c1fd77b1dc60fd6a8db6600a29a · Patch
• https://github.com/openclaw/openclaw/security/advisories/GHSA-37v6-fxx8-xjmx · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-37v6-fxx8-xjmx · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-41351 · Security Note
• https://osv.dev/vulnerability/GHSA-m958-864j-xq5w · Vendor Advisory
• https://github.com/openclaw/openclaw · Note
• https://github.com/openclaw/openclaw/releases/tag/v2026.3.31 · Note
• https://vulncheck.com/advisories/openclaw-webhook-replay-detection-bypass-via-base64-signature-re-encoding · Note
• https://twitter.com/CVEnew/status/2048168358181572913 · Twitter Post