CVE-2026-40037

Description

## 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.

How to fix CVE-2026-40037

To remediate CVE-2026-40037, upgrade the affected package to a fixed version below.

• —upgrade to 2026.4.8 or later

Is CVE-2026-40037 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 2026.4.8

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-40037
• PATCHgithub.com/openclaw/openclaw
• WEBgithub.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5
• WEBgithub.com/openclaw/openclaw/security/advisories/GHSA-qx8j-g322-qj6m