How severe is CVE-2026-42439?

No CVSS score has been assigned to CVE-2026-42439 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-42439?

CVE-2026-42439 affects the following packages: openclaw (npm). Ecosystems affected: npm.

How do I fix CVE-2026-42439?

Update openclaw to 2026.4.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-42439 is resolved across your whole dependency graph.

How do I detect CVE-2026-42439 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openclaw, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-42439 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2026-42439?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-42439 can be triaged on real exposure rather than presence alone.

Is CVE-2026-42439 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-42439 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-42439?

CVE-2026-42439 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 16th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-42439?

CVE-2026-42439 is classified as CWE-862 (CWE-862), Server-Side Request Forgery (SSRF) (CWE-918). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-42439 published, and has it been updated?

CVE-2026-42439 was published on May 5, 2026 and was last updated on August 12, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2026-42439 — openclaw

Fix: openclaw/openclaw@48c0347

CVE-2026-42439 is a CWE-862 vulnerability in openclaw. A fix is available for openclaw — see the affected versions and patch details below.

OpenClaw < 2026.4.10 - SSRF Policy Bypass in Browser Tabs Action Routes

Also known asGHSA-rj2p-j66c-mgqh

Published

May 5, 2026

Updated

Aug 12, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-42439.

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs16th percentile — riskier than 16% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

133other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

openclawnpm

2.7Mdownloads / week

Description

Summary

Browser tabs action select and close routes bypassed SSRF policy.

Affected Packages / Versions

Package: openclaw
Ecosystem: npm
Affected versions: < 2026.4.10
Patched versions: >= 2026.4.10

Impact

The browser /tabs/action select and close branches could operate on targets without enforcing configured browser SSRF policy, weakening tab-level navigation protections.

Technical Details

The fix enforces browser SSRF policy in the select and close tab-action branches.

Fix

The issue was fixed in #63332. The first stable tag containing the fix is v2026.4.10, and [email protected] includes the fix.

Fix Commit(s)

48c0347921b7e9438af0312968fc360ca88023f3
PR: #63332

Release Process Note

Users should upgrade to openclaw 2026.4.10 or newer. The latest npm release, 2026.4.14, already includes the fix.

Credits

Thanks to @tdjackey for reporting this issue.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`openclaw`	all versions	2026.4.10`npm install openclaw@2026.4.10`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openclaw, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update openclaw to 2026.4.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-42439 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-42439 can be triaged on real exposure rather than presence alone.

Tailored to CVE-2026-42439. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

## Summary Browser tabs action select and close routes bypassed SSRF policy. ## Affected Packages / Versions - Package: `openclaw` - Ecosystem: npm - Affected versions: `< 2026.4.10` - Patched versions: `>= 2026.4.10` ## Impact The browser `/tabs/action` select and close branches could operate on targets without enforcing configured browser SSRF policy, weakening tab-level navigation protections. ## Technical Details The fix enforces browser SSRF policy in the select and close tab-action branches. ## Fix The issue was fixed in #63332. The first stable tag containing the fix is `v2026.

O3 Security · Impact-Aware SCA

Is CVE-2026-42439 in your dependencies?

O3 Security finds CVE-2026-42439 across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works