How severe is GHSA-f8mp-x433-5wpf?

GHSA-f8mp-x433-5wpf has a CVSS score of 9.3/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-f8mp-x433-5wpf?

GHSA-f8mp-x433-5wpf affects the following packages: wrangler (npm), wrangler (npm). Ecosystems affected: npm.

How do I fix GHSA-f8mp-x433-5wpf?

Update wrangler to 3.19.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f8mp-x433-5wpf is resolved across your whole dependency graph.

How do I detect GHSA-f8mp-x433-5wpf in my npm dependencies?

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

How do I mitigate GHSA-f8mp-x433-5wpf if there is no patch (or I can't update yet)?

Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Is GHSA-f8mp-x433-5wpf actively exploited in the wild?

No public exploit code has been indexed for GHSA-f8mp-x433-5wpf 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 GHSA-f8mp-x433-5wpf?

GHSA-f8mp-x433-5wpf has an EPSS (Exploit Prediction Scoring System) score of 0.6%, placing it in the 50th 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 GHSA-f8mp-x433-5wpf?

GHSA-f8mp-x433-5wpf is classified as Improper Privilege Management (CWE-269). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-f8mp-x433-5wpf published, and has it been updated?

GHSA-f8mp-x433-5wpf was published on January 3, 2024 and was last updated on July 8, 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

CRITICAL severity

Arbitrary remote code execution within `wrangler dev` Workers sandboxGHSA-f8mp-x433-5wpf

CRITICALFix: cloudflare/workers-sdk#4437

GHSA-f8mp-x433-5wpf is a critical-severity (CVSS 9.3) Improper Privilege Management vulnerability in wrangler. A fix is available for wrangler — see the affected versions and patch details below.

Also known asCVE-2023-7080

Published

Jan 3, 2024

Updated

Jul 8, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs 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.

298other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

wranglernpm

41.9Mdownloads / week

Description

Impact

The V8 inspector intentionally allows arbitrary code execution within the Workers sandbox for debugging. wrangler dev would previously start an inspector server listening on all network interfaces. This would allow an attacker on the local network to connect to the inspector and run arbitrary code. Additionally, the inspector server did not validate Origin/Host headers, granting an attacker that can trick any user on the local network into opening a malicious website the ability to run code. If wrangler dev --remote was being used, an attacker could access production resources if they were bound to the worker.

Patches

This issue was fixed in [email protected] and [email protected]. Whilst wrangler dev's inspector server listens on local interfaces by default as of [email protected], an SSRF vulnerability in miniflare allowed access from the local network until [email protected]. [email protected] and [email protected] introduced validation for the Origin/Host headers.

Workarounds

Unfortunately, Wrangler doesn't provide any configuration for which host that inspector server should listen on. Please upgrade to at least [email protected], and configure Wrangler to listen on local interfaces instead with wrangler dev --ip 127.0.0.1 to prevent SSRF. This removes the local network as an attack vector, but does not prevent an attack from visiting a malicious website.

References

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`wrangler`	≥ 3.0.0&&< 3.19.0	3.19.0`npm install wrangler@3.19.0`
📦npm	`wrangler`	≥ 2.0.0&&< 2.20.2	2.20.2`npm install wrangler@2.20.2`

Affected Products

1 product · 2 configurations

Application

wranglercloudflare

≥ 3.0.0 && < 3.19.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for wrangler, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update wrangler to 3.19.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f8mp-x433-5wpf is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

### Impact The V8 inspector intentionally allows arbitrary code execution within the Workers sandbox for debugging. `wrangler dev` would previously start an inspector server listening on all network interfaces. This would allow an attacker on the local network to connect to the inspector and run arbitrary code. Additionally, the inspector server did not validate `Origin`/`Host` headers, granting an attacker that can trick any user on the local network into opening a malicious website the ability to run code. If `wrangler dev --remote` was being used, an attacker could access production resourc