Cloudflare pingora up to 0.4.x HTTP Request request smuggling

Summaryinfo

A vulnerability described as problematic has been identified in Cloudflare pingora up to 0.4.x. Affected by this issue is some unknown functionality of the component HTTP Request Handler. The manipulation results in request smuggling. This vulnerability is cataloged as CVE-2025-4366. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in Cloudflare pingora up to 0.4.x. Affected is an unknown code block of the component HTTP Request Handler. The manipulation with an unknown input leads to a request smuggling vulnerability. CWE is classifying the issue as CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-4366 since 05/05/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available.

Upgrading to version 0.5.0 eliminates this vulnerability.

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Productinfo

Type

• Cloud Software

Vendor

• Cloudflare

Name

• pingora

Version

• 0.1
• 0.2
• 0.3
• 0.4

CPE 2.3info

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CPE 2.2info

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