{"cve":"CVE-2023-26964","nvd":{"published":"2023-04-11T14:15:07.677","modified":"2026-06-17T05:44:01.510","status":"Modified","description":"An issue was discovered in hyper v0.13.7. h2-0.2.4 Stream stacking occurs when the H2 component processes HTTP2 RST_STREAM frames. As a result, the memory and CPU usage are high which can lead to a Denial of Service (DoS).","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":["CWE-770"],"references":["https://github.com/hyperium/hyper/issues/2877","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZHBAE7LQARMPUEEV4TWET4D7G6WCWBUD/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYRZ5Y2ALATKKPIITAFAJIS4TR4LUAHO/","https://github.com/hyperium/hyper/issues/2877","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZHBAE7LQARMPUEEV4TWET4D7G6WCWBUD/"],"products":["hyper:h2","hyper:hyper"],"source":"nvd","synced_at":"2026-10-19T21:38:05.473481323+00:00"},"epss":{"cve":"CVE-2023-26964","score":0.01121,"percentile":0.662,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-f8vr-r385-rh5r","url":"https://osv.dev/vulnerability/GHSA-f8vr-r385-rh5r","summary":"h2 vulnerable to denial of service","modified":"2023-11-08T04:12:03.011700Z","packages":[{"ecosystem":"crates.io","name":"h2","purl":"pkg:cargo/h2","ranges":["<0.3.17"],"fixed":["0.3.17"]}]},{"id":"RUSTSEC-2023-0034","url":"https://osv.dev/vulnerability/RUSTSEC-2023-0034","summary":"Resource exhaustion vulnerability in h2 may lead to Denial of Service (DoS)","modified":"2023-11-08T04:12:03.011700Z","packages":[{"ecosystem":"crates.io","name":"h2","purl":"pkg:cargo/h2","ranges":[">=0.0.0-0 <0.3.17"],"fixed":["0.3.17"]}]}],"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."]}