HTTP Request Smuggling Vulnerability in Pingora Proxy by Cloudflare
CVE-2026-2833

9.3CRITICAL

Key Information:

Vendor

Cloudflare

Status
Https://github.com/cloudflare/pingora
Vendor
CVE Published:
4 March 2026

What is CVE-2026-2833?

A vulnerability was identified in the Pingora proxy used by Cloudflare, specifically linked to HTTP/1.1 connection upgrades. This flaw allows an attacker to exploit requests that include an Upgrade header, enabling them to manipulate the connection to forward a malicious payload before the backend server has acknowledged the upgrade. Such exploitation can lead to serious consequences, including the circumvention of proxy-level security measures and the hijacking of user sessions. Affected users are advised to upgrade to Pingora v0.8.0 or higher to mitigate the risks associated with this vulnerability.

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Deploy the Patch

Affected Version(s)

https://github.com/cloudflare/pingora 0 < 0.8.0

References

https://github.com/cloudflare/pingora

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Rajat Raghav (xclow3n)
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