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9.3
Pingora Proxy Can Allow Attackers to Bypass Security Controls
GHSA-f9v3-j2m7-4hpg
Summary
A vulnerability in Pingora's proxy software can let attackers sneak malicious requests past security controls, potentially allowing them to hijack user sessions or inject malicious data into caches and upstream connections. This issue affects standalone Pingora deployments that face external traffic. To fix this, ensure you're running the latest Pingora version to prevent potential attacks.
What to do
- Update pingora-core to version 0.8.0.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| – | pingora-core | <= 0.8.0 | 0.8.0 |
Original title
Duplicate Advisory: HTTP Request Smuggling via Premature Upgrade
Original description
### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-xq2h-p299-vjwv. This link is maintained to preserve external references.
### Original Description
An HTTP request smuggling vulnerability (CWE-444) was found in Pingora's handling of HTTP/1.1 connection upgrades. The issue occurs when a Pingora proxy reads a request containing an Upgrade header, causing the proxy to pass through the rest of the bytes on the connection to a backend before the backend has accepted the upgrade. An attacker can thus directly forward a malicious payload after a request with an Upgrade header to that backend in a way that may be interpreted as a subsequent request header, bypassing proxy-level security controls and enabling cross-user session hijacking.
Impact
This vulnerability primarily affects standalone Pingora deployments where a Pingora proxy is exposed to external traffic. An attacker could exploit this to:
* Bypass proxy-level ACL controls and WAF logic
* Poison caches and upstream connections, causing subsequent requests from legitimate users to receive responses intended for smuggled requests
* Perform cross-user attacks by hijacking sessions or smuggling requests that appear to originate from the trusted proxy IP
Cloudflare's CDN infrastructure was not affected by this vulnerability, as ingress proxies in the CDN stack maintain proper HTTP parsing boundaries and do not prematurely switch to upgraded connection forwarding mode.
Mitigation:
Pingora users should upgrade to Pingora v0.8.0 or higher
As a workaround, users may return an error on requests with the Upgrade header present in their request filter logic in order to stop processing bytes beyond the request header and disable downstream connection reuse.
This advisory has been withdrawn because it is a duplicate of GHSA-xq2h-p299-vjwv. This link is maintained to preserve external references.
### Original Description
An HTTP request smuggling vulnerability (CWE-444) was found in Pingora's handling of HTTP/1.1 connection upgrades. The issue occurs when a Pingora proxy reads a request containing an Upgrade header, causing the proxy to pass through the rest of the bytes on the connection to a backend before the backend has accepted the upgrade. An attacker can thus directly forward a malicious payload after a request with an Upgrade header to that backend in a way that may be interpreted as a subsequent request header, bypassing proxy-level security controls and enabling cross-user session hijacking.
Impact
This vulnerability primarily affects standalone Pingora deployments where a Pingora proxy is exposed to external traffic. An attacker could exploit this to:
* Bypass proxy-level ACL controls and WAF logic
* Poison caches and upstream connections, causing subsequent requests from legitimate users to receive responses intended for smuggled requests
* Perform cross-user attacks by hijacking sessions or smuggling requests that appear to originate from the trusted proxy IP
Cloudflare's CDN infrastructure was not affected by this vulnerability, as ingress proxies in the CDN stack maintain proper HTTP parsing boundaries and do not prematurely switch to upgraded connection forwarding mode.
Mitigation:
Pingora users should upgrade to Pingora v0.8.0 or higher
As a workaround, users may return an error on requests with the Upgrade header present in their request filter logic in order to stop processing bytes beyond the request header and disable downstream connection reuse.
ghsa CVSS4.0
9.3
Vulnerability type
CWE-444
Published: 5 Mar 2026 · Updated: 7 Mar 2026 · First seen: 6 Mar 2026