CVE-2026-34511: OpenClaw before 2026.4.2 reuses the PKCE verifier as the OAuth state parameter in the Gemini OAuth flow, expos

Routine

MEDIUM 5.3UPGRADE

CVE-2026-34511 is a medium-severity flaw (CVSS 5.3) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenClaw before 2026.4.2 reuses the PKCE verifier as the OAuth state parameter in the Gemini OAuth flow, exposing it through the redirect URL. Attackers who capture the redirect URL can obtain both the authorization code and PKCE verifier, defeating PKCE protection and enabling token redemption.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-330
Published	2026-04-03
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

2026-04-03 21:17 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 2026.4.2

Fixed in: 2026.4.2

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.4.2

npm install openclaw@">=2026.4.2"

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-2026-34511?

openclaw: upgrade to 2026.4.2. Exact commands for each OS are on this page.

Is CVE-2026-34511 being exploited?

CVE-2026-34511 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-2026-34511 affect?

CVE-2026-34511 affects openclaw. Severity is medium (CVSS 5.3). OpenClaw before 2026.4.2 reuses the PKCE verifier as the OAuth state parameter in the Gemini OAuth flow, exposing it through the redirect URL. Attackers who capture the redirect URL can obtain both the authorization code and PKCE verifier,

How urgent is CVE-2026-34511?

Priority 22/100. No elevated risk signals yet.

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References

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