CVE-2026-40037: OpenClaw before 2026.3.31 (patched in 2026.4.8) contains a request body replay vulnerability in fetchWithSsrFG

Routine

MEDIUM 6.5UPGRADE

CVE-2026-40037 is a medium-severity flaw (CVSS 6.5) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): VulnCheck · Vendor: openclaw

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 22:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 2026.4.8

Fixed in: 2026.4.8

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.4.8

npm install openclaw@">=2026.4.8"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40037?

openclaw: upgrade to 2026.4.8. Exact commands for each OS are on this page.

Is CVE-2026-40037 being exploited?

CVE-2026-40037 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40037 affect?

CVE-2026-40037 affects openclaw. Severity is medium (CVSS 6.5). 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 redire

How urgent is CVE-2026-40037?

Priority 29/100. No elevated risk signals yet.

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References

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