# Cesanta vulnerabilities Source: https://junglewise.ai/threats/vendors/cesanta Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 12 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/vendors/cesanta.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 21 vulnerabilities in Cesanta: 0 in the last 7 days and 15 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-115473, was published on 4 November 2026. 5 vulnerabilities in the last four weeks, up 400% on the four before (1). 1 technology has a page of its own. ## Counts - Last 7 days: 0 - Last 30 days: 5 - Last 90 days: 15 - All time: 21 (2 critical, 0 exploited in the wild) ## About Cesanta Vendor providing Mongoose OS, an embedded operating system for IoT and microcontroller applications. ## Latest Cesanta vulnerabilities - [CVE-2026-115473: Mongoose heap out-of-bounds read in path validation](https://junglewise.ai/threats/cve-2026-115473-mongoose-is-an-embedded-web-server-and-network-library-prior-to) (medium, CVSS 6.5, published 4 Nov 2026) - [CVE-2026-73261: Mongoose TCP option parser bounds check vulnerability](https://junglewise.ai/threats/cve-2026-73261-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-73260: Mongoose TLS certificate parser bounds check in DER parsing](https://junglewise.ai/threats/cve-2026-73260-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-73252: Mongoose TLS short-record out-of-bounds read](https://junglewise.ai/threats/cve-2026-73252-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-63626: Mongoose IPv6CP length field bounds check buffer overflow](https://junglewise.ai/threats/cve-2026-63626-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 8.8, published 14 Oct 2026) - [CVE-2026-101003: Cesanta Mongoose stack-based buffer overflow in MQTT broker](https://junglewise.ai/threats/cve-2026-101003-a-weakness-has-been-identified-in-cesanta-mongoose-up-to-7-21) (medium, CVSS 5.3, published 28 Sep 2026) - [CVE-2026-86716: Cesanta mJS heap buffer overflow in skip_spaces_and_comments](https://junglewise.ai/threats/cve-2026-86716-cesanta-mjs-heap-buffer-overflow-in-skip-spaces-and-comments) (high, CVSS 7.3, published 8 Sep 2026) - [CVE-2026-73259: Mongoose reflected cross-site scripting in directory listing](https://junglewise.ai/threats/cve-2026-73259-mongoose-reflected-cross-site-scripting-in-directory-listing) (medium, CVSS 5.4, published 20 Aug 2026) - [CVE-2026-73258: Mongoose multipart header truncation via CR/LF parsing](https://junglewise.ai/threats/cve-2026-73258-mongoose-multipart-header-truncation-via-cr-lf-parsing) (medium, CVSS 6.5, published 20 Aug 2026) - [CVE-2026-73257: Mongoose HTTP request desynchronization](https://junglewise.ai/threats/cve-2026-73257-mongoose-http-request-desynchronization) (critical, CVSS 9.1, published 20 Aug 2026) - [CVE-2026-73256: Mongoose HTTP/1.0 request smuggling via chunked encoding](https://junglewise.ai/threats/cve-2026-73256-mongoose-http-1-0-request-smuggling-via-chunked-encoding) (critical, CVSS 9.1, published 20 Aug 2026) - [CVE-2026-73255: Cesanta Mongoose directory traversal in SSI processing](https://junglewise.ai/threats/cve-2026-73255-cesanta-mongoose-directory-traversal-in-ssi-processing) (medium, CVSS 6.5, published 20 Aug 2026) - [CVE-2026-73254: Cesanta Mongoose stored cross-site scripting in directory listing](https://junglewise.ai/threats/cve-2026-73254-cesanta-mongoose-stored-cross-site-scripting-in-directory-listing) (medium, CVSS 5.4, published 20 Aug 2026) - [CVE-2026-73253: Mongoose wildcard certificate hostname verification bypass](https://junglewise.ai/threats/cve-2026-73253-mongoose-wildcard-certificate-hostname-verification-bypass) (info, CVSS 6.5, published 20 Aug 2026) - [CVE-2026-73251: Mongoose TLS certificate-chain verification bypass with CA bundles](https://junglewise.ai/threats/cve-2026-73251-mongoose-tls-certificate-chain-verification-bypass-with-ca) (info, published 20 Aug 2026) - [CVE-2026-11404: Cesanta Mongoose out-of-bounds read in mg_tls_server_recv_hello](https://junglewise.ai/threats/cve-2026-11404-cesanta-mongoose-out-of-bounds-read-in-mg-tls-server-recv-hello) (high, CVSS 7.5, published 9 Jul 2026) - [CVE-2026-6986: A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function…](https://junglewise.ai/threats/cve-2026-6986-a-security-vulnerability-has-been-detected-in-cesanta-mongoose-up) (low, CVSS 3.7, published 25 Apr 2026) - [CVE-2026-6985: A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of…](https://junglewise.ai/threats/cve-2026-6985-a-weakness-has-been-identified-in-cesanta-mongoose-up-to-7-20-this) (medium, CVSS 5.3, published 25 Apr 2026) - [CVE-2026-5246: A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature…](https://junglewise.ai/threats/cve-2026-5246-a-vulnerability-was-determined-in-cesanta-mongoose-up-to-7-20) (medium, CVSS 5.6, published 2 Apr 2026) - [CVE-2026-5245: A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handle_mdns_record of the file…](https://junglewise.ai/threats/cve-2026-5245-a-vulnerability-was-found-in-cesanta-mongoose-up-to-7-20-this) (medium, CVSS 5.6, published 2 Apr 2026) - [CVE-2026-5244: A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg_tls_recv_cert of the file…](https://junglewise.ai/threats/cve-2026-5244-a-vulnerability-has-been-found-in-cesanta-mongoose-up-to-7-20-this) (high, CVSS 7.3, published 2 Apr 2026) ## Most severe Cesanta vulnerabilities - [CVE-2026-73257: Mongoose HTTP request desynchronization](https://junglewise.ai/threats/cve-2026-73257-mongoose-http-request-desynchronization) (critical, CVSS 9.1, published 20 Aug 2026) - [CVE-2026-73256: Mongoose HTTP/1.0 request smuggling via chunked encoding](https://junglewise.ai/threats/cve-2026-73256-mongoose-http-1-0-request-smuggling-via-chunked-encoding) (critical, CVSS 9.1, published 20 Aug 2026) - [CVE-2026-63626: Mongoose IPv6CP length field bounds check buffer overflow](https://junglewise.ai/threats/cve-2026-63626-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 8.8, published 14 Oct 2026) - [CVE-2026-73252: Mongoose TLS short-record out-of-bounds read](https://junglewise.ai/threats/cve-2026-73252-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-73261: Mongoose TCP option parser bounds check vulnerability](https://junglewise.ai/threats/cve-2026-73261-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-73260: Mongoose TLS certificate parser bounds check in DER parsing](https://junglewise.ai/threats/cve-2026-73260-mongoose-is-an-embedded-web-server-and-network-library-prior-to-7) (high, CVSS 7.5, published 14 Oct 2026) - [CVE-2026-11404: Cesanta Mongoose out-of-bounds read in mg_tls_server_recv_hello](https://junglewise.ai/threats/cve-2026-11404-cesanta-mongoose-out-of-bounds-read-in-mg-tls-server-recv-hello) (high, CVSS 7.5, published 9 Jul 2026) - [CVE-2026-5244: A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg_tls_recv_cert of the file…](https://junglewise.ai/threats/cve-2026-5244-a-vulnerability-has-been-found-in-cesanta-mongoose-up-to-7-20-this) (high, CVSS 7.3, published 2 Apr 2026) - [CVE-2026-86716: Cesanta mJS heap buffer overflow in skip_spaces_and_comments](https://junglewise.ai/threats/cve-2026-86716-cesanta-mjs-heap-buffer-overflow-in-skip-spaces-and-comments) (high, CVSS 7.3, published 8 Sep 2026) - [CVE-2026-73255: Cesanta Mongoose directory traversal in SSI processing](https://junglewise.ai/threats/cve-2026-73255-cesanta-mongoose-directory-traversal-in-ssi-processing) (medium, CVSS 6.5, published 20 Aug 2026) ## Vulnerabilities per week 5 vulnerabilities in the last four weeks, up 400% on the four before (1). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 8 | 2 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 1 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 1 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 4 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 1 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Cesanta technologies - [Cesanta Mongoose](https://junglewise.ai/threats/technologies/cesanta-mongoose): 11 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Cesanta vulnerabilities", https://junglewise.ai/threats/vendors/cesanta, 12 November 2026.