{"cve":"CVE-2023-29406","nvd":{"published":"2023-07-11T20:15:10.643","modified":"2026-06-17T05:49:58.927","status":"Modified","description":"The HTTP/1 client does not fully validate the contents of the Host header. A maliciously crafted Host header can inject additional headers or entire requests. With fix, the HTTP/1 client now refuses to send requests containing an invalid Request.Host or Request.URL.Host value.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","score":6.5},"cwes":["CWE-436"],"references":["https://go.dev/cl/506996","https://go.dev/issue/60374","https://groups.google.com/g/golang-announce/c/2q13H6LEEx0","https://pkg.go.dev/vuln/GO-2023-1878","https://security.gentoo.org/glsa/202311-09"],"products":["golang:go"],"source":"nvd","synced_at":"2026-10-19T21:38:30.124994567+00:00"},"epss":{"cve":"CVE-2023-29406","score":0.01453,"percentile":0.73431,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GO-2023-1878","url":"https://osv.dev/vulnerability/GO-2023-1878","summary":"Insufficient sanitization of Host header in net/http","modified":"2026-02-04T04:31:14.443108Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.19.11",">=1.20.0-0 <1.20.6"],"fixed":["1.19.11","1.20.6"]}]}],"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."]}