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CVE

CVE-2026-40037

OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects
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CVE

CVE-2026-40037

OpenClaw: `fetchWithSsrFGuard` replays unsafe request bodies across cross-origin redirects

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.1
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
6.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Related Resources

No items found.

References

https://github.com/openclaw/openclaw/security/advisories/GHSA-qx8j-g322-qj6m, https://nvd.nist.gov/vuln/detail/CVE-2026-40037, https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5, https://github.com/openclaw/openclaw, https://www.vulncheck.com/advisories/openclaw-unsafe-request-body-replay-via-fetchwithssrfguard-cross-origin-redirects

Severity

6.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
6.5
EPSS Probability
0.00037%
EPSS Percentile
0.11449%
Introduced Version
0,2026.3.22-beta.1,2026.2.15,2026.2.6-1,2026.2.6,2026.2.2,2026.1.29-beta.1,2026.1.27-beta.1,2026.1.20,2026.1.14-1
Fix Available
2026.4.8,2026.4.7

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