CVE-2025-4366 json
Request Smuggling Vulnerability in Pingora
published last yr. modified 4mo ago also GHSA-93c7-7xqw-w357 , RUSTSEC-2025-0037 , EUVD-2025-16165
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Is CVE-2025-4366 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.4 | 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 |
| CNA | 4.0 | 7.4 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | pingora-core | <0.5.0 >=0.0.0-0, <0.5.0 |
0.5.0 |
Classification
- Weakness
-
- CWE-444 Inconsistent Interpretation of HTTP Requests
References
-
github.com
/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff
web
-
github.com
/cloudflare/pingora
package, product
-
github.com
/cloudflare/pingora/security/advisories/GHSA-93c7-7xqw-w357
web
-
nvd.nist.gov
/vuln/detail/CVE-2025-4366
advisory
-
blog.cloudflare.com
/resolving-a-request-smuggling-vulnerability-in-pingora
web
-
rustsec.org
/advisories/RUSTSEC-2025-0037.html
web, advisory
-
crates.io
/crates/pingora-core
package
-
blog.cloudflare.com
/resolving-a-request-smuggling-vulnerability-in-pingora/
web
Sources
- CVE List CVE-2025-4366
- GitHub Advisory GHSA-93c7-7xqw-w357
- NVD CVE-2025-4366
- OSV RUSTSEC-2025-0037
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