Request Smuggling Vulnerability in Pingora
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | pingora-core (crates.io) | before 0.5.0 | 0.5.0 | Patch available | GHSA-93c7-7xqw-w357 |
- pingora-core (crates.io) Vendor— Affected before 0.5.0 Fixed in 0.5.0 Patch available GHSA-93c7-7xqw-w357
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cloudflare:pingora:*:*:*:*:*:*:*:* | before 0.5.0 | Vulnerable | Cloudflare |
- cpe:2.3:a:cloudflare:pingora:*:*:*:*:*:*:*:* Versions before 0.5.0 Vulnerable ·Cloudflare
Remediation
- Fix · GHSA-93c7-7xqw-w357 pingora-core (crates.io) Fixed in 0.5.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-4366
- 2026-10-03 Alias added: GHSA-93c7-7xqw-w357
References
Other 5
- https://github.com/cloudflare/pingora
- https://github.com/cloudflare/pingora/security/advisories/GHSA-93c7-7xqw-w357
- https://github.com/cloudflare/pingora/commit/fda3317ec822678564d641e7cf1c9b77ee3759ff
- https://blog.cloudflare.com/resolving-a-request-smuggling-vulnerability-in-pingora
- https://rustsec.org/advisories/RUSTSEC-2025-0037.html
More Cloudflare Pingora vulnerabilities
- TI-2026-02435 HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Misparsing CVSS 4.0CRITICAL 9.3
- TI-2026-02433 HTTP Request Smuggling via Premature Upgrade CVSS 4.0CRITICAL 9.3
- TI-2026-02436 Cache poisoning via insecure-by-default cache key CVSS 4.0HIGH 8.4
Sources
- CVE-2025-4366 · CVE Program
- CVE-2025-4366 · NVD
- FIRST EPSS
- GHSA-93c7-7xqw-w357 · GitHub Advisory Database · CC BY 4.0
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