Vendor
Cesanta vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 10 vulnerabilities in Cesanta: 0 in the last 7 days and 10 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-86716, was published on 8 September 2026.
- Last 7 days
- 0
- Last 90 days
- 10
- Critical, all time
- 2
- Exploited in the wild
- 0
Latest Cesanta vulnerabilities
- 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
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-2026-11404: Cesanta Mongoose out-of-bounds read in mg_tls_server_recv_hellohighCVSS 7.5
- 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%
- CVE-2026-73258: Mongoose multipart header truncation via CR/LF parsingmediumCVSS 6.5EPSS 0.5%
- CVE-2026-73259: Mongoose reflected cross-site scripting in directory listingmediumCVSS 5.4EPSS 0.4%
- 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%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 1 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 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 |
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, 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, 26 September 2026.