{"cve":"CVE-2015-5739","nvd":{"published":"2017-10-18T20:29:00.277","modified":"2026-06-17T00:29:41.300","status":"Modified","description":"The net/http library in net/textproto/reader.go in Go before 1.4.3 does not properly parse HTTP header keys, which allows remote attackers to conduct HTTP request smuggling attacks via a space instead of a hyphen, as demonstrated by \"Content Length\" instead of \"Content-Length.\"","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-444"],"references":["http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.html","http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.html","http://rhn.redhat.com/errata/RHSA-2016-1538.html","http://seclists.org/oss-sec/2015/q3/237","http://seclists.org/oss-sec/2015/q3/292"],"products":["fedoraproject:fedora","golang:go","redhat:enterprise_linux_server","redhat:enterprise_linux_server_aus","redhat:enterprise_linux_server_eus","redhat:enterprise_linux_server_tus"],"source":"nvd","synced_at":"2026-10-19T20:47:01.408438353+00:00"},"epss":{"cve":"CVE-2015-5739","score":0.09625,"percentile":0.95485,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GO-2021-0159","url":"https://osv.dev/vulnerability/GO-2021-0159","summary":"Request smuggling due to improper header parsing in net/http","modified":"2024-05-20T16:03:47Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.4.3"],"fixed":["1.4.3"]}]}],"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."]}