CVE-2026-2833 is a critical HTTP request smuggling vulnerability (CWE-444) in Pingora's handling of HTTP/1.1 connection upgrades, specifically affecting standalone Pingora deployments. This flaw allows an attacker to bypass proxy-level security controls like WAFs and ACLs, poison caches, and potentially hijack user sessions by directly forwarding malicious payloads after a request with an Upgrade header. With a CVSS score of 9.3 (CRITICAL), it presents a significant risk due to its network-based attack vector and low attack complexity. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has garnered some community discussion, and users are advised to upgrade to Pingora v0.8.0 or implement a workaround by filtering Upgrade headers.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.8.0CPE matchmatch criteria | cpe:2.3:a:cloudflare:pingora:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/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
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.