CVE-2026-40037 — OpenClaw < 2026.3.31 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects

Affected: OpenClaw

OpenClaw before 2026.3.31 (patched in 2026.4.8) contains a request body replay vulnerability in fetchWithSsrFGuard that allows unsafe request bodies to be resent across cross-origin redirects. Attackers can exploit this by triggering redirects to exfiltrate sensitive request data or headers to unintended origins.

GHSA-qx8j-g322-qj6m — OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects

Affected: npm: openclaw

## Impact

`fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects.

A guarded fetch could resend unsafe request bodies or headers when following cross-origin redirects.

OpenClaw is a user-controlled local assistant. This advisory is scoped to the OpenClaw trust model and does not assume a multi-tenant service boundary.

## Affected Packages / Versions

- Package: `openclaw` (npm) - Affected versions: `<2026.3.31` - Patched versions: `2026.4.8`

## Fix

The issue was fixed on `main` and is available in the patched npm version listed above. The verified fixed tree is commit `d7c3210cd6f5fdfdc1beff4c9541673e814354d5`.

## Verification

The fix was re-checked against `main` before publication, including targeted regression tests for the affected security boundary.

## Credits

Thanks @BG0ECV for reporting.

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CVE-2026-40037 — OpenClaw < 2026.3.31 - Unsafe Request Body Replay via fetchWithSsrFGuard Cross-Origin Redirects

GHSA-qx8j-g322-qj6m — OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects