{"cve":"CVE-2023-34188","nvd":{"published":"2023-06-23T20:15:09.053","modified":"2026-06-17T06:03:05.500","status":"Modified","description":"The HTTP server in Mongoose before 7.10 accepts requests containing negative Content-Length headers. By sending a single attack payload over TCP, an attacker can cause an infinite loop in which the server continuously reparses that payload, and does not respond to any other requests.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1284"],"references":["https://blog.narfindustries.com/blog/narf-discovers-critical-vulnerabilities-in-cesanta-mongoose-http-server","https://github.com/cesanta/mongoose/commit/4663090a8fb036146dfe77718cff612b0101cb0f","https://github.com/cesanta/mongoose/compare/7.9...7.10","https://github.com/cesanta/mongoose/pull/2197","https://blog.narfindustries.com/blog/narf-discovers-critical-vulnerabilities-in-cesanta-mongoose-http-server"],"products":["cesanta:mongoose"],"source":"nvd","synced_at":"2026-10-19T21:38:30.124994567+00:00"},"epss":{"cve":"CVE-2023-34188","score":0.01005,"percentile":0.62979,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}