CVE-2026-73257 Mongoose: Content-Length + Transfer-Encoding coexistence enables request smuggling

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 Content-Length and Transfer-Encoding: chunked. The clcount and tecount checks in the mghttpparse and httpcb paths in src/http.c accept both...

CVE-2026-73257

Mongoose versions before 7.22 allow CL.TE request smuggling: mg_http_parse() and http_cb() in src/http.c accept both Content-Length and Transfer-Encoding: chunked headers, prioritizing chunked encoding while a Content-Length-preferring reverse proxy uses a different boundary, enabling injected re...

EUVD-2026-63492

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 Content-Length and Transfer-Encoding: chunked. The clcount and tecount checks in the mghttpparse and httpcb paths in src/http.c accept both...

CVE-2026-73257 Mongoose: Content-Length + Transfer-Encoding coexistence enables request smuggling

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 Content-Length and Transfer-Encoding: chunked. The clcount and tecount checks in the mghttpparse and httpcb paths in src/http.c accept both...

CVE-2026-73257

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 Content-Length and Transfer-Encoding: chunked. The clcount and tecount checks in the mghttpparse and httpcb paths in src/http.c accept both...

CVE-2026-73257 Mongoose: Content-Length + Transfer-Encoding coexistence enables request smuggling

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 Content-Length and Transfer-Encoding: chunked. The clcount and tecount checks in the mghttpparse and httpcb paths in src/http.c accept both...

PT-2026-79078

Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can create a file with an HTML payload in its name can trigger stored cross-site scripting when a user browses a directory served with MG ENABLE DIRLIST. The printdirentry path called by listdir in src/http.c...

PT-2026-79079

Mongoose is an embedded web server and network library. Prior to 7.22, an attacker who can control an SSI-enabled file can place directory traversal sequences in an include file or include virtual directive. The mg ssi function in src/ssi.c concatenates the directive argument into a filesystem pa...

PT-2026-79081

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 Content-Length and Transfer-Encoding: chunked. The cl count and te count checks in the mg http parse and http cb paths in src/http.c accept bot...

PT-2026-79080

Name of the Vulnerable Software and Affected Versions Mongoose versions prior to 7.22 Description 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...

PT-2026-79082

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can place a lone carriage return or line feed in multipart input processed by mg http next multipart in src/http.c. The loops comparing sb and sb + 1, and sh2 and sh2 + 1, use an incorrect AND condition and...

PT-2026-79077

Mongoose is an embedded web server and network library. Prior to version 7.22, an on-path network attacker with a wildcard certificate for a parent domain can impersonate deeper subdomains to a client using the built-in TLS stack. The mg tls verify cert san and mg tls verify cert cn functions in...

PT-2026-79083

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can send a crafted percent-encoded request path to a deployment using MG ENABLE DIRLIST and persuade a user to visit it. The mg http serve dir and listdir path in src/http.c places the decoded request URI int...

ROOT-APP-NPM-CVE-2026-42334 CVE-2026-42334 in mongoose - Patched by Root

Root has patched CVE-2026-42334 in the mongoose package for Root:npm. Multiple fixed versions available...

CVE-2026-73562

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.10, 7.8.10, 8.24.1, and 9.7.2, passing a user-controlled update such as MyModel.updateOnefilter, req.body can exploit Mongoose update casting with a proto.x dotted path under $set...

CVE-2026-73562 Mongoose: Prototype pollution in the update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.10, 7.8.10, 8.24.1, and 9.7.2, passing a user-controlled update such as MyModel.updateOnefilter, req.body can exploit Mongoose update casting with a proto.x dotted path under $set...

CVE-2026-73562 Mongoose: Prototype pollution in the update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.10, 7.8.10, 8.24.1, and 9.7.2, passing a user-controlled update such as MyModel.updateOnefilter, req.body can exploit Mongoose update casting with a proto.x dotted path under $set...

CVE-2026-73562

CVE-2026-73562 describes a prototype-pollution vulnerability in Mongoose (MongoDB object modeling tool) via update casting that can occur when a user-controlled update uses a proto -prefixed dotted path under $set. Prior to versions 6.13.10, 7.8.10, 8.24.1, and 9.7.2, schema logic can treat inher...

JLSEC-2026-1257 Cesanta Mongoose before 7.22 contains an out-of-bounds read in the built-in TLS server function...

Cesanta Mongoose before 7.22 contains an out-of-bounds read in the built-in TLS server function mgtlsserverrecvhello, which uses an attacker-controlled sessionidlen byte from a TLS ClientHello as a buffer index without validating it against the length of received data. A remote, unauthenticated...

CVE-2026-11404

A flaw was found in Mongoose. An out-of-bounds read vulnerability exists in the built-in TLS server function mgtlsserverrecvhello. A remote, unauthenticated attacker can exploit this by sending a specially crafted TLS ClientHello message with an oversized session ID length. This can lead to readi...