{"cve":"CVE-2023-45288","nvd":{"published":"2024-04-04T21:15:16.113","modified":"2026-06-17T06:28:35.580","status":"Deferred","description":"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.","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":[],"references":["http://www.openwall.com/lists/oss-security/2024/04/03/16","http://www.openwall.com/lists/oss-security/2024/04/05/4","https://go.dev/cl/576155","https://go.dev/issue/65051","https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:48:32.179249784+00:00"},"epss":{"cve":"CVE-2023-45288","score":0.91969,"percentile":0.99819,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-4v7x-pqxf-cx7m","url":"https://osv.dev/vulnerability/GHSA-4v7x-pqxf-cx7m","summary":"net/http, x/net/http2: close connections when receiving too many headers","modified":"2026-09-10T03:50:11.106451165Z","packages":[{"ecosystem":"Go","name":"net/http","purl":"pkg:golang/net/http","ranges":["<1.21.9"],"fixed":["1.21.9"]},{"ecosystem":"Go","name":"golang.org/x/net/http2","purl":"pkg:golang/golang.org/x/net/http2","ranges":["<0.23.0"],"fixed":["0.23.0"]},{"ecosystem":"Go","name":"net/http","purl":"pkg:golang/net/http","ranges":[">=1.22.0-0 <1.22.2"],"fixed":["1.22.2"]},{"ecosystem":"Go","name":"golang.org/x/net","purl":"pkg:golang/golang.org/x/net","ranges":["<0.23.0"],"fixed":["0.23.0"]}]},{"id":"GO-2024-2687","url":"https://osv.dev/vulnerability/GO-2024-2687","summary":"HTTP/2 CONTINUATION flood in net/http","modified":"2026-02-04T04:09:31.762399Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.21.9",">=1.22.0-0 <1.22.2"],"fixed":["1.21.9","1.22.2"]},{"ecosystem":"Go","name":"golang.org/x/net","purl":"pkg:golang/golang.org/x/net","ranges":["<0.23.0"],"fixed":["0.23.0"]}]}],"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."]}