Cesanta has 19 CVEs on record between 2024 and 2026. Disclosure cadence is accelerating: 14 in the last 90 days against 0 in the 90 before. The busiest recent month was August 2026 with 8. The median CVSS is 7.5 (high), with 4 rated critical. None have a confirmed exploitation report. The most common weakness class is CWE-125 (4). Most affected products: mongoose (18), mJS (1).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 7.5
- Publish → KEV
- —
- Last 90 days
- 14 prev 0
Worst active — by depth score
CVE-2026-73260High· 7.5Mongoose is an embedded web server and network library53CVE-2026-73252High· 7.5Mongoose is an embedded web server and network library53CVE-2026-86716High· 7.3A vulnerability was determined in Cesanta mJS up to 1.2652CVE-2026-73257Critical· 9.1Mongoose is an embedded web server and network library50CVE-2026-73256Critical· 9.1Mongoose is an embedded web server and network library50
Cesanta vulnerabilities
CVEs affecting Cesanta, newest first. Open any entry for full detail, references, and exploit status.
19 CVEsRSS
CVE-2026-73261High· 7.5Mongoose is an embedded web server and network library
Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TCP/IP stack enabled by MG_ENABLE_TCPIP in src/net_builtin.c does not reject a TCP option whose declared opts[1] length exceeds the remaining option byte…
CVE-2026-73260High· 7.5PoCMongoose is an embedded web server and network library
Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TLS certificate parser selected by MG_TLS_BUILTIN fails to verify that a long-form DER element length fits within the remaining certificate buffer. In mg…
CVE-2026-73252High· 7.5PoCMongoose is an embedded web server and network library
Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TLS stack selected by MG_TLS_BUILTIN in src/tls_builtin.c accepts a TLS 1.3 record whose decrypted size is exactly the 16-byte authentication tag with no…
CVE-2026-63626High· 8.8Mongoose is an embedded web server and network library
Mongoose is an embedded web server and network library. Prior to 7.23, ppp_handle_ipv6cp() in src/l2_ppp.c trusts the 16-bit IPv6CP len field without checking it against the received payload size. On a PPP or PPPoE link using MG_ENABLE_T…
CVE-2026-101003Medium· 5.3A weakness has been identified in Cesanta Mongoose up to 7.21
A weakness has been identified in Cesanta Mongoose up to 7.21. Affected by this vulnerability is the function fn of the file tutorials/mqtt/mqtt-server/main.c of the component MQTT Broker. Executing a manipulation can lead to stack-based…
CVE-2026-86716High· 7.3PoCA vulnerability was determined in Cesanta mJS up to 1.26
A vulnerability was determined in Cesanta mJS up to 1.26. Affected is the function skip_spaces_and_comments of the file src/mjs_tok.c. Executing a manipulation can lead to heap-based buffer overflow. The attack can be launched remotely. …
CVE-2026-73251Critical· 9.1Mongoose is an embedded web server and network library
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/tls_builtin.c, the mg_tls_init() function s…
CVE-2026-73258Medium· 6.5PoCMongoose is an embedded web server and network library
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 s[b] and s…
CVE-2026-73259Medium· 5.4Mongoose is an embedded web server and network library
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…
CVE-2026-73257Critical· 9.1Mongoose is an embedded web server and network library
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 …
CVE-2026-73256Critical· 9.1Mongoose is an embedded web server and network library
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 h…
CVE-2026-73255Medium· 6.5Mongoose is an embedded web server and network library
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 sr…
CVE-2026-73254Medium· 5.4Mongoose is an embedded web server and network library
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_DIRLI…
CVE-2026-73253Critical· 9.1Mongoose is an embedded web server and network library
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…
CVE-2024-42392Medium· 4.0Improper Neutralization of Delimiters vulnerability in Cesanta Mongoose Web Server v7.14 allows to trigger an infinite loop bug if the input string contains unexpected characters.
Improper Neutralization of Delimiters vulnerability in Cesanta Mongoose Web Server v7.14 allows to trigger an infinite loop bug if the input string contains unexpected characters.
CVE-2024-42391Medium· 4.3Use of Out-of-range Pointer Offset vulnerability in Cesanta Mongoose Web Server v7.14 allows an attacker to send an unexpected TLS packet and force the application to read unintended heap memory space.
Use of Out-of-range Pointer Offset vulnerability in Cesanta Mongoose Web Server v7.14 allows an attacker to send an unexpected TLS packet and force the application to read unintended heap memory space.
CVE-2024-42386High· 8.2Use of Out-of-range Pointer Offset vulnerability in Cesanta Mongoose Web Server v7.14 allows an attacker to send an unexpected TLS packet and produce a segmentation fault on the application.
Use of Out-of-range Pointer Offset vulnerability in Cesanta Mongoose Web Server v7.14 allows an attacker to send an unexpected TLS packet and produce a segmentation fault on the application.
CVE-2024-42385Medium· 4.0Improper Neutralization of Delimiters vulnerability in Cesanta Mongoose Web Server v7.14 allows to trigger an out-of-bound memory write if the PEM certificate contains unexpected characters.
Improper Neutralization of Delimiters vulnerability in Cesanta Mongoose Web Server v7.14 allows to trigger an out-of-bound memory write if the PEM certificate contains unexpected characters.
CVE-2024-42384High· 7.5Integer Overflow or Wraparound vulnerability in Cesanta Mongoose Web Server v7.14 allows an attacker to send an unexpected TLS packet and produce a segmentation fault on the application.
Integer Overflow or Wraparound vulnerability in Cesanta Mongoose Web Server v7.14 allows an attacker to send an unexpected TLS packet and produce a segmentation fault on the application.