# CVE-2025-4366: Request Smuggling Vulnerability in Pingora

> CVE-2025-4366: Request Smuggling Vulnerability in Pingora. CVSS 6.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-4366
Last updated: 2026-06-17T09:33:07Z

- Published: 2025-05-22 15:50 UTC · Updated: 2026-06-17 09:33 UTC · Assigner: cloudflare
- CVSS: 6.1 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS: 0.54%, 45th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-444

## Description

A request smuggling vulnerability identified within Pingora’s proxying framework, pingora-proxy, allows malicious HTTP requests to be injected via manipulated request bodies on cache HITs, leading to unauthorized request execution and potential cache poisoning. Fixed in:  https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff  Impact: The issue could lead to request smuggling in cases where Pingora’s proxying framework, pingora-proxy, is used for caching allowing an attacker to manipulate headers and URLs in subsequent requests made on the same HTTP/1.1 connection.

## Affected vendors and products

_None listed._

## Tracked companies

- [Cloudflare](https://rewindex.com/company/cloudflare.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-4366)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-4366)
- [https://github.com/cloudflare/pingora](https://github.com/cloudflare/pingora)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2025-4366 · Markdown: https://rewindex.com/cve/CVE-2025-4366.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-4366 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T01:58:44.050Z