CVE-2026-86716

Cesanta mJS versions up to 1.26 contain a heap-based buffer overflow in the function skip_spaces_and_comments (file src/mjs_tok.c ). The flaw can be triggered remotely with no authentication required. The exploit has been publicly disclosed with proof-of-concept maturity, but the project has not ...

CVE-2026-86716 Cesanta mJS mjs_tok.c skip_spaces_and_comments heap-based overflow

A vulnerability was determined in Cesanta mJS up to 1.26. Affected is the function skipspacesandcomments of the file src/mjstok.c. Executing a manipulation can lead to heap-based buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The...

EUVD-2026-73943

A vulnerability was determined in Cesanta mJS up to 1.26. Affected is the function skipspacesandcomments of the file src/mjstok.c. Executing a manipulation can lead to heap-based buffer overflow. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The...

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...

DEBIAN-CVE-2026-11404

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...

EUVD-2026-42605

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...

Linux Distros Unpatched Vulnerability : CVE-2021-26529

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - The mgtlsinit function in Cesanta Mongoose HTTPS server 7.0 and 6.7-6.18 compiled with mbedTLS support is vulnerable to remote OOB write attack via connection...

Linux Distros Unpatched Vulnerability : CVE-2026-5244

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mgtlsrecvcert of the file mongoose.c of the component TLS 1.3 Handler...

Linux Distros Unpatched Vulnerability : CVE-2026-6985

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handleopt of the file /src/netbuiltin.c of the component...

Linux Distros Unpatched Vulnerability : CVE-2021-26530

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - The mgtlsinit function in Cesanta Mongoose HTTPS server 7.0 compiled with OpenSSL support is vulnerable to remote OOB write attack via connection request after...

Linux Distros Unpatched Vulnerability : CVE-2020-25756

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A buffer overflow vulnerability exists in the mggethttpheader function in Cesanta Mongoose 6.18 due to a lack of bounds checking. A crafted HTTP header can...

Linux Distros Unpatched Vulnerability : CVE-2021-26528

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - The mghttpservefile function in Cesanta Mongoose HTTP server 7.0 is vulnerable to remote OOB write attack via connection request after exhausting memory pool...

Linux Distros Unpatched Vulnerability : CVE-2026-5246

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mgtlsverifycertsignature of the file mongoose.c of the component P-384...

Linux Distros Unpatched Vulnerability : CVE-2025-65502

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Null pointer dereference in addcacerts in Cesanta Mongoose before 7.2 allows remote attackers to cause a denial of service via TLS initialization where...

Linux Distros Unpatched Vulnerability : CVE-2026-6986

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function mgaesgcmdecrypt of the file /src/tlsaes128.c of the...

Linux Distros Unpatched Vulnerability : CVE-2023-2905

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Due to a failure in validating the length of a provided MQTTCMDPUBLISH parsed message with a variable length header, Cesanta Mongoose, an embeddable web server,...

JLSEC-2026-367 A security vulnerability has been detected in Cesanta Mongoose up to 7.20

A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This affects the function getpeer of the file /src/netbuiltin.c of the component TCP Sequence Number Handler. The manipulation leads to improper verification of source of a communication channel. The attack may be initiate...

JLSEC-2026-368 A vulnerability was detected in Cesanta Mongoose up to 7.20

A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mgchacha20poly1305decrypt of the file /src/tlschacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be...

JLSEC-2026-370 A vulnerability was found in Cesanta Mongoose up to 7.20

A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handlemdnsrecord of the file mongoose.c of the component mDNS Record Handler. Performing a manipulation of the argument buf results in stack-based buffer overflow. Remote exploitation of the attack is possible. A...

JLSEC-2026-371 A vulnerability was determined in Cesanta Mongoose up to 7.20

A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mgtlsverifycertsignature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature...