# CVE-2026-40175: Axios has Unrestricted Cloud Metadata Exfiltration via Header Injection Chain

- Exploited (CISA KEV): no
- Published: 2026-04-10
- CVSS: 4.8 MEDIUM (v3.1)
- EPSS: 1.9% (80th percentile)
- CWE: CWE-113, CWE-444, CWE-918

Axios is a promise based HTTP client for the browser and Node.js. Versions prior to 1.15.0 and 0.3.1 are vulnerable to a specific gadget-style attack chain in which prototype pollution in a third-party dependency may be leveraged to inject unsanitized header values into outbound requests. This vulnerability is fixed in 1.15.0 and 0.3.1.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Blocks by default | 2026-06-09 | 60 |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Cloudflare

- 2026-06-09 · new · rule b4f88cb767874def810edd0b387cf935 · default Block
  > Axios - Prototype Pollution - CVE:CVE-2026-40175. Previous action: Log. New action: Block. This is a new detection.
  Source: https://developers.cloudflare.com/changelog/post/2026-06-09-waf-release/

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-40175 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-40175