{"id":"CVE-2023-45288","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-45288","generatedAt":"2026-11-04T22:05:05.610Z","title":"An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames.","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.","published":"2024-04-04T21:15:16.000Z","lastModified":"2026-06-17T06:28:36.000Z","status":"Deferred","sourceIdentifier":"security@golang.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":[],"affected":[],"epss":{"score":0.91969,"percentile":0.99819,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 92.0%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2024/04/03/16","source":"security@golang.org"},{"url":"http://www.openwall.com/lists/oss-security/2024/04/05/4","source":"security@golang.org"},{"url":"https://go.dev/cl/576155","source":"security@golang.org"},{"url":"https://go.dev/issue/65051","source":"security@golang.org"},{"url":"https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M","source":"security@golang.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT/","source":"security@golang.org"},{"url":"https://pkg.go.dev/vuln/GO-2024-2687","source":"security@golang.org"},{"url":"https://security.netapp.com/advisory/ntap-20240419-0009/","source":"security@golang.org"},{"url":"http://www.openwall.com/lists/oss-security/2024/04/03/16","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.openwall.com/lists/oss-security/2024/04/05/4","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://go.dev/cl/576155","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://go.dev/issue/65051","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://pkg.go.dev/vuln/GO-2024-2687","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20240419-0009/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.kb.cert.org/vuls/id/421644","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-45288","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}