CVE-2026-73259

CVE-2026-73259 is a reflected cross-site scripting (XSS) vulnerability in Mongoose , an embedded web server and network library, affecting versions prior to 7.22 . The flaw resides in the mg_http_serve_dir() and listdir() functions in src/http.c, which insert a percent-decoded request URI into th...

EUVD-2026-63498

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 MGENABLEDIRLIST and persuade a user to visit it. The mghttpservedir and listdir path in src/http.c places the decoded request URI into the...

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...

EUVD-2026-63497

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...

CVE-2026-73256 Mongoose: HTTP/1.0 detection off-by-one enables request smuggling via chunked TE

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...

CVE-2026-73256

Mongoose (an embedded web server and network library by cesanta) prior to 7.22 is vulnerable to HTTP request smuggling via chunked Transfer-Encoding. The root cause is a logic error in http_cb() in src/http.c: it tests hm.proto.len with an impossible greater-than-eight condition, so is_http_1_0 i...

CVE-2026-73256 Mongoose: HTTP/1.0 detection off-by-one enables request smuggling via chunked TE

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...

CVE-2026-73254

Mongoose (embedded web server and network library) prior to 7.22 is vulnerable to stored cross-site scripting via unescaped filenames in directory listings. The root cause is in printdirentry() called by listdir() in src/http.c: the function URL-encodes the href attribute but inserts the raw file...

CVE-2026-73254

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 MGENABLEDIRLIST. The printdirentry path called by listdir in src/http.c...

CVE-2026-73254 Mongoose: Stored XSS via unescaped filenames in directory listing

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 MGENABLEDIRLIST. The printdirentry path called by listdir in src/http.c...

EUVD-2026-63496

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 MGENABLEDIRLIST. The printdirentry path called by listdir in src/http.c...

CVE-2026-73254 Mongoose: Stored XSS via unescaped filenames in directory listing

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 MGENABLEDIRLIST. The printdirentry path called by listdir in src/http.c...

CVE-2026-73258 Mongoose: Multipart boundary/header scan logic error in mg_http_next_multipart

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 mghttpnextmultipart in src/http.c. The loops comparing sb and sb + 1, and sh2 and sh2 + 1, use an incorrect AND condition and stop...

CVE-2026-73258 Mongoose: Multipart boundary/header scan logic error in mg_http_next_multipart

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 mghttpnextmultipart in src/http.c. The loops comparing sb and sb + 1, and sh2 and sh2 + 1, use an incorrect AND condition and stop...

CVE-2026-73258

In Mongoose prior to 7.22, mg_http_next_multipart() in src/http.c uses an incorrect AND condition when scanning for CRLF terminators in multipart input. A lone carriage return or line feed causes premature truncation of headers, filenames, or boundaries, allowing an attacker to present a misleadi...

CVE-2026-73258 Mongoose: Multipart boundary/header scan logic error in mg_http_next_multipart

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 mghttpnextmultipart in src/http.c. The loops comparing sb and sb + 1, and sh2 and sh2 + 1, use an incorrect AND condition and stop...

EUVD-2026-63495

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 mghttpnextmultipart in src/http.c. The loops comparing sb and sb + 1, and sh2 and sh2 + 1, use an incorrect AND condition and stop...

CVE-2026-73258

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 mghttpnextmultipart in src/http.c. The loops comparing sb and sb + 1, and sh2 and sh2 + 1, use an incorrect AND condition and stop...

CVE-2026-73251

Mongoose (embedded web server and network library) prior to 7.23 contains a critical TLS certificate verification flaw in src/tls_builtin.c. When a client is configured with a multi-certificate CA bundle, mg_tls_init() stores the bundle in tls->ca_bundle_der while tls->ca_der.len remains ze...

CVE-2026-73251 Mongoose Built-in TLS: CA-bundle certificate chain accepted without any signature verification

Mongoose is an embedded web server and network library. Prior to 7.23, a network attacker can impersonate a TLS server to a Mongoose client configured with a multi-certificate CA bundle. In src/tlsbuiltin.c, the mgtlsinit function stores the bundle in tls-cabundleder while tls-cader.len remains...