A malformed HTTP chunked body can lead to a denial-of-service and peg the CPU

Summary A malformed HTTP message using Transfer-Encoding: chunked can drive React\Http\Io\ChunkedDecoder into an infinite loop, pegging a CPU core and freezing the event loop. Because ReactPHP is single-threaded, one such message stalls the entire process for every client until it is killed. Both...

CVE-2026-19203

A client may issue specially crafted HTTP/1.1 chunked requests to a Jetty server that cause Jetty and an intermediary proxy to interpret different request boundaries, potentially resulting in HTTP request smuggling. This is caused by Jetty accepting a lone LF character as a terminator in parts of...

OESA-2026-3692 libsoup security update

libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications. Security Fixes: A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTT...

EUVD-2026-71219

Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service. parsehexprefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response's chunk-size field into an arbitrary-precision...

PT-2026-85536

Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service. parse hex prefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response's chunk-size field into an arbitrary-precision...

CVE-2026-84947: Improper Input Validation

undici's dump interceptor reads and discards a response body up to a configurable maximum size. When a response declares a Content-Length that exceeds the maximum, the interceptor aborts cleanly, but when a response has no Content-Length and is chunked, the interceptor instead signals completion...

CVE-2026-69664 httpd parks a request worker indefinitely on a malformed chunk size sent after the headers

Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending a request with a chunked body whose chunk-size line is not a hexadecimal number. The worker serving the connection is never...

EEF-CVE-2026-69664 httpd parks a request worker indefinitely on a malformed chunk size sent after the headers

Summary Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending a request with a chunked body whose chunk-size line is not a hexadecimal number. The worker serving the connection i...

CVE-2026-69664

Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending a request with a chunked body whose chunk-size line is not a hexadecimal number. The worker serving the connection is never...

PT-2026-84266

Name of the Vulnerable Software and Affected Versions OTP versions 17.0 through 27.3.4.16 OTP versions 28.0 through 28.5.0.5 OTP versions 29.0 through 29.0.5 inets versions 5.10 through 9.3.2.6 inets versions 9.4 through 9.6.2.2 inets versions 9.7 through 9.7.1 Description The check header/3...

curl: 53: HTTP/1 CONNECT chunked-407 trailers bypass CURLOPT_SUPPRESS_CONNECT_HEADERS and lose CURLH_CONNECT classification

Summary When an HTTP/1 proxy returns a chunked 407 Proxy Authentication Required during a CONNECT handshake, any trailer fields in that response are delivered to the header callback even when CURLOPTSUPPRESSCONNECTHEADERS is enabled, and are classified as CURLHTRAILER instead of CURLHCONNECT in t...

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WatsonWebserver contains an HTTP/1 request body size-limit bypass when processing requests using Transfer-Encoding: chunked. The framework's configured Settings.IO.MaxRequestBodySize limit is enforced when a request declares its body size using Content-Length. However, requests using chunked...

vibeio-http has a DoS vulnerability in HTTP/1.x chunked encoding parser triggered by maliciously crafted chunk lengths

When using the affected versions of the vibeio-http crate, an attacker could craft a malicious HTTP/1.x request with a large chunk length between usize::MAX - 1 and usize::MAX inclusive and send it, causing the server to crash integer overflow panic in debug builds, splitto out of bounds panic in...

GHSA-FX4F-MHW4-QM7J vibeio-http has a DoS vulnerability in HTTP/1.x chunked encoding parser triggered by maliciously crafted chunk lengths

When using the affected versions of the vibeio-http crate, an attacker could craft a malicious HTTP/1.x request with a large chunk length between usize::MAX - 1 and usize::MAX inclusive and send it, causing the server to crash integer overflow panic in debug builds, splitto out of bounds panic in...

JLSEC-2026-1380

Mongoose is an embedded web server and network library. Prior to 7.22, a remote unauthenticated attacker can exploit an HTTP/1.0 reverse-proxy deployment by sending a request with Transfer-Encoding: chunked and conflicting framing. The httpcb function in src/http.c tests hm.proto.len with an...

PT-2026-85158

Mongoose is an embedded web server and network library. Prior to 7.22, a remote unauthenticated attacker can exploit an HTTP/1.0 reverse-proxy deployment by sending a request with Transfer-Encoding: chunked and conflicting framing. The http cb function in src/http.c tests hm.proto.len with an...

Linux Distros Unpatched Vulnerability : CVE-2026-73257

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Mongoose is an embedded web server and network library. Priro to version 7.22, a remote unauthenticated attacker can send an HTTP request containing both...

Linux Distros Unpatched Vulnerability : CVE-2026-73256

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Mongoose is an embedded web server and network library. Prior to 7.22, a remote unauthenticated attacker can exploit an HTTP/1.0 reverse-proxy deployment by...

DEBIAN-CVE-2026-73256

Mongoose is an embedded web server and network library. Prior to 7.22, a remote unauthenticated attacker can exploit an HTTP/1.0 reverse-proxy deployment by sending a request with Transfer-Encoding: chunked and conflicting framing. The httpcb function in src/http.c tests hm.proto.len with an...

AZL-96903 CVE-2026-63379 affecting package libtevent 0.14.1-1

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttpreadtrailer and merges them into request headers. The fix introduces evhttpparseheadersimpl and a temporary trailer header list. An unauthenticated remote...