Vendor
Cesanta vulnerabilities
Updated . Rebuilt every hour.
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.
- Last 7 days
- 0
- Last 90 days
- 15
- Critical, all time
- 2
- Exploited in the wild
- 0
About Cesanta
Vendor providing Mongoose OS, an embedded operating system for IoT and microcontroller applications.
Cesanta technologies
Latest Cesanta vulnerabilities
- CVE-2026-115473: Mongoose heap out-of-bounds read in path validationmediumCVSS 6.5
- CVE-2026-73261: Mongoose TCP option parser bounds check vulnerabilityhighCVSS 7.5EPSS 0.4%
- CVE-2026-73260: Mongoose TLS certificate parser bounds check in DER parsinghighCVSS 7.5EPSS 0.2%
- CVE-2026-73252: Mongoose TLS short-record out-of-bounds readhighCVSS 7.5EPSS 0.4%
- CVE-2026-63626: Mongoose IPv6CP length field bounds check buffer overflowhighCVSS 8.8EPSS 0.2%
- CVE-2026-101003: Cesanta Mongoose stack-based buffer overflow in MQTT brokermediumCVSS 5.3
- CVE-2026-86716: Cesanta mJS heap buffer overflow in skip_spaces_and_commentshighCVSS 7.3EPSS 0.6%
- CVE-2026-73259: Mongoose reflected cross-site scripting in directory listingmediumCVSS 5.4EPSS 0.4%
- CVE-2026-73258: Mongoose multipart header truncation via CR/LF parsingmediumCVSS 6.5EPSS 0.5%
- CVE-2026-73257: Mongoose HTTP request desynchronizationcriticalCVSS 9.1EPSS 0.7%
- CVE-2026-73256: Mongoose HTTP/1.0 request smuggling via chunked encodingcriticalCVSS 9.1EPSS 0.7%
- CVE-2026-73255: Cesanta Mongoose directory traversal in SSI processingmediumCVSS 6.5EPSS 0.8%
- CVE-2026-73254: Cesanta Mongoose stored cross-site scripting in directory listingmediumCVSS 5.4EPSS 0.3%
- CVE-2026-73253: Mongoose wildcard certificate hostname verification bypassinfoCVSS 6.5EPSS 0.4%
- CVE-2026-73251: Mongoose TLS certificate-chain verification bypass with CA bundlesinfoEPSS 0.3%
- CVE-2026-11404: Cesanta Mongoose out-of-bounds read in mg_tls_server_recv_hellohighCVSS 7.5
- CVE-2026-6986: A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This issue affects the function…lowCVSS 3.7EPSS 0.2%
- CVE-2026-6985: A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of…mediumCVSS 5.3EPSS 0.6%
- CVE-2026-5246: A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature…mediumCVSS 5.6EPSS 0.6%
- CVE-2026-5245: A vulnerability was found in Cesanta Mongoose up to 7.20. This impacts the function handle_mdns_record of the file…mediumCVSS 5.6EPSS 0.7%
- 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…highCVSS 7.3EPSS 0.7%
Most severe Cesanta vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-73257: Mongoose HTTP request desynchronizationcriticalCVSS 9.1EPSS 0.7%
- CVE-2026-73256: Mongoose HTTP/1.0 request smuggling via chunked encodingcriticalCVSS 9.1EPSS 0.7%
- CVE-2026-63626: Mongoose IPv6CP length field bounds check buffer overflowhighCVSS 8.8EPSS 0.2%
- CVE-2026-73252: Mongoose TLS short-record out-of-bounds readhighCVSS 7.5EPSS 0.4%
- CVE-2026-73261: Mongoose TCP option parser bounds check vulnerabilityhighCVSS 7.5EPSS 0.4%
- CVE-2026-73260: Mongoose TLS certificate parser bounds check in DER parsinghighCVSS 7.5EPSS 0.2%
- CVE-2026-11404: Cesanta Mongoose out-of-bounds read in mg_tls_server_recv_hellohighCVSS 7.5
- 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…highCVSS 7.3EPSS 0.7%
- CVE-2026-86716: Cesanta mJS heap buffer overflow in skip_spaces_and_commentshighCVSS 7.3EPSS 0.6%
- CVE-2026-73255: Cesanta Mongoose directory traversal in SSI processingmediumCVSS 6.5EPSS 0.8%
Vulnerabilities per week
5 vulnerabilities in the last four weeks, up 400% on the four before (1). The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 8 | 2 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 1 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 1 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 4 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 1 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Cesanta vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/vendors/cesanta)<a href="https://junglewise.ai/threats/vendors/cesanta"><img src="https://junglewise.ai/threats/vendors/cesanta/badge.svg" alt="Cesanta vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/vendors/cesanta.json, and this page as text at https://junglewise.ai/threats/vendors/cesanta.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Cesanta vulnerabilities", https://junglewise.ai/threats/vendors/cesanta, 12 November 2026.