{"id":"CVE-2021-31525","aliases":["BIT-golang-2021-31525","GHSA-h86h-8ppg-mxmh","GO-2022-0236"],"url":"https://o3.security/vulnerability/CVE-2021-31525","summary":"golang.org/x/net/http/httpguts vulnerable to Uncontrolled Recursion","details":"net/http in Go before 1.15.12 and 1.16.x before 1.16.4 allows remote attackers to cause a denial of service (panic) via a large header to ReadRequest or ReadResponse. Server, Transport, and Client can each be affected in some configurations.","published":"2021-05-27T13:15:08.207Z","modified":"2026-07-08T06:02:32.902541597Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"golang.org/x/net","fixedVersion":"0.0.0-20210428140749-89ef3d95e781"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ISRZZ6NY5R2TBYE72KZFOCO25TEUQTBF/"},{"type":"ADVISORY","url":"https://groups.google.com/g/golang-announce/c/cu9SP4eSXMc"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202208-02"},{"type":"FIX","url":"https://github.com/golang/go/issues/45710"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:02:32.902541597Z"}}