Weaknesses of type CWE-444

365 results

Interpretação inconsistente de requisições HTTP (HTTP Request Smuggling)

Ocorre quando um proxy, load balancer ou firewall interpreta uma requisição HTTP de forma diferente do servidor backend. O atacante injeta headers ou manipula o tamanho do corpo da requisição (via Content-Length ou Transfer-Encoding) para fazer o intermediário e o servidor final processar requisições distintas. Isso permite contornar controles de segurança, envenenar caches, sequestrar sessões de outros usuários ou executar ataques no servidor.

Example

Um atacante envia uma requisição com dois headers Content-Length conflitantes, ou mistura Content-Length com Transfer-Encoding chunked. O proxy interpreta o fim da requisição em um ponto, enquanto o servidor backend interpreta em outro, fazendo com que parte do payload do atacante seja concatenado à próxima requisição de um usuário legítimo.

How to mitigate

Normalize e valide rigorosamente headers HTTP (Content-Length, Transfer-Encoding) em proxies e servidores; use HTTP/2 ou HTTP/3 que mitigam o problema; mantenha proxy e backend sincronizados quanto à interpretação de requisições; desabilite HTTP/1.0 se possível e aplique filtros que rejeitem requisições ambíguas ou malformadas.

CVE-2026-52845HIGHCaddy: FastCGI header normalization bypass in `forward_auth copy_headers`EPSS 0.4%CVE-2025-65114HIGHApache Traffic Server: Malformed chunked message body allows request smugglingEPSS 0.4%CVE-2025-3110MEDIUMOpenVPN Access Server 2.7.2 through 3.1.0 accepts bare line-feed sequences inside HTTP header values, allowing remote attackers to perform HEPSS 0.4%CVE-2026-41873CRITICALPony Mail: Admin account takeover via request smugglingEPSS 0.4%CVE-2026-88009HIGHTraefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access loggingEPSS 0.4%CVE-2026-69243MEDIUMAIOHTTP: HTTP request smuggling via WebSocket upgradeEPSS 0.4%CVE-2023-29476CRITICALIn Menlo On-Premise Appliance before 2.88, web policy may not be consistently applied properly to intentionally malformed client requests. TEPSS 0.4%CVE-2024-27185CRITICAL[20240802] - Core - Cache Poisoning in PaginationEPSS 0.4%CVE-2026-33805CRITICAL@fastify/reply-from vulnerable to connection header abuse enabling stripping of proxy-added headersEPSS 0.4%CVE-2026-73256CRITICALMongoose: HTTP/1.0 detection off-by-one enables request smuggling via chunked TEEPSS 0.4%CVE-2026-59898MEDIUMNetty: WebSockets V07/V08 handshaker missing Connection/Upgrade validationEPSS 0.4%CVE-2026-54387CRITICALTinyproxy - HTTP Request Smuggling via CL/TE DesynchronizationEPSS 0.4%CVE-2026-54388CRITICALTinyproxy - HTTP Request Smuggling via Duplicate Content-Length HeadersEPSS 0.4%CVE-2026-63718HIGHApache HTTP Server: mod_proxy_uwsgi Transfer-Encoding response smugglingEPSS 0.4%CVE-2026-118264CRITICALEcho: Rejected WebSocket upgrades can bypass Echo route-level access controlsEPSS 0.4%CVE-2025-41082MEDIUMHTTP Request/Response Smuggling in Altitude Communication ServerEPSS 0.4%CVE-2016-15039MEDIUMmhuertos phpLDAPadmin ajax_functions.js makeHttpRequest request smugglingEPSS 0.4%CVE-2026-78660HIGHHTTP/2 transport accepts malformed framing-related headers in net/httpEPSS 0.4%CVE-2026-105299HIGHPingora forwards client-nominated Connection headers to HTTP/1 upstreams, allowing ACL bypass in specific chained deploymentsEPSS 0.4%CVE-2025-0752HIGHEnvoyproxy: openshift service mesh envoy http header sanitization bypass leading to dos and unauthorized accessEPSS 0.4%