CVE-2025-4366: Pingora core Pingora Has A Request Smuggling Vulnerability

HIGH
Advisory Identifier: GHSA-93c7-7xqw-w357
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CWE-444
Published
Advisory Summary

CVE-2025-4366 is a HIGH pingora has a request smuggling vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Pingora core libraries in the crates.io ecosystem. The issue involves pingora has a request smuggling vulnerability. Remediation is available by upgrading affected packages to version 0.5.0.

CVE-2025-4366 at a Glance

CVE Identifier CVE-2025-4366
GHSA Identifier GHSA-93c7-7xqw-w357
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Product Pingora core
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix CVE-2025-4366

To remediate this vulnerability, upgrade all affected Pingora core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pingora-core fixed: 0.5.0 
Upgrade pingora-core to 0.5.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for pingora-core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-4366, inspect your project dependencies for Pingora core:

inspect dependencies for pingora-core

Analyze the terminal output to locate any version of Pingora core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where 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. In Pingora core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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 ### 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.

CVE-2025-4366 Affected Pingora core Versions

1 component(s)
Fixed Versions:
0.5.0
Product / Package Ecosystem Affected Versions Fixed Version
pingora-core
 crates.io
< 0.5.0
0.5.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/cloudflare/pingora/security/advisories/GHSA-93c7-7xqw-w357
NVD — CVE-2025-4366 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-4366
Security Fix Commit FIX COMMIT
https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff
blog.cloudflare.com/resolving-a-request... WEB
https://blog.cloudflare.com/resolving-a-request-smuggling-vulnerability-in-pingora
Pingora core Source Repository REPOSITORY
https://github.com/cloudflare/pingora
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2025-0037.html

Frequently Asked Questions

What is CVE-2025-4366?
CVE-2025-4366 is a security vulnerability in Pingora core involving Pingora has a Request Smuggling Vulnerability under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling').
Which Pingora core versions are affected?
Affected versions include releases prior to 0.5.0 across affected packages: pingora-core.
What version fixes CVE-2025-4366?
Upgrading to 0.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pingora-core affected?
Yes, pingora-core is affected in releases prior to 0.5.0. Upgrade your dependency to 0.5.0 or later.
What CWE is associated with CVE-2025-4366?
CVE-2025-4366 is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (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.).
How can I check crates.io dependencies for CVE-2025-4366?
Run the dependency tree command: 'inspect dependencies for pingora-core'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-93c7-7xqw-w357",
  "modified" : "2025-06-20T18:07:47Z",
  "published" : "2025-06-20T18:07:47Z",
  "aliases" : [ "CVE-2025-4366" ],
  "summary" : "Pingora has a Request Smuggling Vulnerability",
  "details" : "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.\n\n### Fixed in\nhttps://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff \n\n### Impact\nThe 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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "pingora-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/pingora/security/advisories/GHSA-93c7-7xqw-w357"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-4366"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff"
  }, {
    "type" : "WEB",
    "url" : "https://blog.cloudflare.com/resolving-a-request-smuggling-vulnerability-in-pingora"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cloudflare/pingora"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2025-0037.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-444" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-06-20T18:07:47Z",
    "nvd_published_at" : null
  }
}