EUVD-2026-63500

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 mgtlsverifycertsan and mgtlsverifycertcn functions in...

CVE-2026-73253 Mongoose: TLS Hostname Verification Bypass via Overly Permissive Wildcard Matching

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 mgtlsverifycertsan and mgtlsverifycertcn functions in...

CVE-2026-73253

Mongoose (embedded web server and network library) prior to version 7.22 is vulnerable to a TLS hostname verification bypass . The root cause is in mg_tls_verify_cert_san() and mg_tls_verify_cert_cn() (in src/tls_builtin.c), which call mg_match() — a function whose wildcard matching can cross DNS...

EUVD-2026-63499

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 mgssi function in src/ssi.c concatenates the directive argument into a filesystem pat...

CVE-2026-73255

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 mgssi function in src/ssi.c concatenates the directive argument into a filesystem pat...

CVE-2026-73255 Mongoose: Path traversal in SSI #include directives enables arbitrary file read

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 mgssi function in src/ssi.c concatenates the directive argument into a filesystem pat...

CVE-2026-73255 Mongoose: Path traversal in SSI #include directives enables arbitrary file read

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 mgssi function in src/ssi.c concatenates the directive argument into a filesystem pat...

CVE-2026-73255

CVE-2026-73255 is a path traversal vulnerability in Mongoose (an embedded web server and network library) prior to version 7.22 . The root cause is in the mg_ssi() function in src/ssi.c , which concatenates the #include or #include virtual directive argument into a filesystem path without calling...

CVE-2026-73259 Mongoose: Reflected XSS via decoded URI in directory listing render

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-2026-73259

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-2026-73259 Mongoose: Reflected XSS via decoded URI in directory listing render

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-2026-73259 Mongoose: Reflected XSS via decoded URI in directory listing render

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-2026-73259

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...

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...

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 (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...