{"id":"CVE-2023-45288","aliases":["BIT-golang-2023-45288","GHSA-4v7x-pqxf-cx7m","GO-2024-2687"],"url":"https://o3.security/vulnerability/CVE-2023-45288","summary":"net/http, x/net/http2: close connections when receiving too many headers","details":"An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.","published":"2024-04-04T21:15:16Z","modified":"2026-07-24T18:29:55.172922794Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.91969,"percentile":0.99813,"asOf":"2026-09-11"},"cisaKev":null,"exploitsKnown":2,"affectedPackages":[{"ecosystem":"Go","name":"net/http","fixedVersion":"1.21.9"},{"ecosystem":"Go","name":"golang.org/x/net/http2","fixedVersion":"0.23.0"},{"ecosystem":"Go","name":"net/http","fixedVersion":"1.22.2"},{"ecosystem":"Go","name":"golang.org/x/net","fixedVersion":"0.23.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20240419-0009/"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2024/04/03/16"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2024/04/05/4"},{"type":"WEB","url":"https://go.dev/cl/576155"},{"type":"WEB","url":"https://go.dev/issue/65051"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT/"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2024-2687"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-24T18:29:55.172922794Z"}}