Cloudflare Schwachstellen (CVE)

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24 Ergebnisse
7.5Hoch
CVE-2026-12523

Resource exhaustion in quiche HTTP/3 and QPACK layers

Cloudflare quiche

Summary Cloudflare quiche's HTTP/3 layer was discovered to be vulnerable to resource exhaustion (i.e., memory) by means of specially crafted HTTP/3 frames. Impact HTTP/3 defines multiple frame types to support HTTP message exchanges and connection m…

5.6Mittel
CVE-2026-11941

Use-after-free in connection ID iterator and FFI functions

Cloudflare Quiche

Cloudflare Quiche was affected by 2 use-after-free vulnerabilities in the connection ID iterator FFI functions. The “quiche_connection_id_iter_next” and “quiche_conn_retired_scid_next” functions would return a pointer to a “ConnectionId” to the application…

8.4Hoch
CVE-2026-2836

Cache poisoning via insecure-by-default cache key

Cloudflare https://github.com/cloudflare/pingora

A cache poisoning vulnerability has been found in the Pingora HTTP proxy framework’s default cache key construction. The issue occurs because the default HTTP cache key implementation generates cache keys using only the URI path, excluding critical factors su…

9.3Kritisch
CVE-2026-2835

HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Misparsing

Cloudflare https://github.com/cloudflare/pingora

An HTTP Request Smuggling vulnerability (CWE-444) has been found in Pingora's parsing of HTTP/1.0 and Transfer-Encoding requests. The issue occurs due to improperly allowing HTTP/1.0 request bodies to be close-delimited and incorrect handling of multiple Tran…

9.3Kritisch
CVE-2026-2833

HTTP Request Smuggling via Premature Upgrade

Cloudflare https://github.com/cloudflare/pingora

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 t…

2.9Niedrig
CVE-2026-1229

Incorrect calculation in CIRCL secp384r1 CombinedMult

Cloudflare CIRCL

The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas. ECDH and ECDSA signing relying on this curve are not affected. The bug was fixe…

7.7Hoch
CVE-2026-0933

OS Command Injection in `wrangler pages deploy`

Cloudflare Wrangler

SummaryA command injection vulnerability (CWE-78) has been found to exist in the `wrangler pages deploy` command. The issue occurs because the `--commit-hash` parameter is passed directly to a shell command without proper validation or sanitization, allowing …

1.5%EPSS
8.7Hoch
CVE-2025-7054

Infinite loop triggered by connection ID retirement

Cloudflare quiche

Cloudflare quiche was discovered to be vulnerable to an infinite loop when sending packets containing RETIRE_CONNECTION_ID frames. QUIC connections possess a set of connection identifiers (IDs); see Section 5.1 of RFC 9000 https://datatracker.ietf.org/doc/h…

7.5Hoch
CVE-2025-4821

Incorrect congestion window growth by invalid ACK ranges

Cloudflare quiche

Impact Cloudflare quiche was discovered to be vulnerable to incorrect congestion window growth, which could cause it to send data at a rate faster than the path might actually support. An unauthenticated remote attacker can exploit the vulnerability by firs…

5.3Mittel
CVE-2025-4820

Incorrect congestion window growth by optimistic ACK

Cloudflare quiche

Impact Cloudflare quiche was discovered to be vulnerable to incorrect congestion window growth, which could cause it to send data at a rate faster than the path might actually support. An unauthenticated remote attacker can exploit the vulnerability by firs…

7.4Hoch
CVE-2025-4366

Request Smuggling Vulnerability in Pingora

Pingora

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 poisonin…

5.3Mittel
CVE-2025-4144

PKCE bypass via downgrade attack

workers-oauth-provider

PKCE was implemented in the OAuth implementation in workers-oauth-provider that is part of MCP framework https://github.com/cloudflare/workers-mcp . However, it was found that an attacker could cause the check to be skipped. Fixed in: https://github.c…

6.0Mittel
CVE-2025-4143

Missing validation of redirect_uri on authorize endpoint

workers-oauth-provider

The OAuth implementation in workers-oauth-provider that is part of MCP framework https://github.com/cloudflare/workers-mcp , did not correctly validate that redirect_uri was on the allowed list of redirect URIs for the given client registration. Fixed in:  …