{"id":"JLSEC-2026-1","summary":"In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of se...","details":"In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., \u003e 32), then drop the connection.","modified":"2026-03-23T22:45:06.482443Z","published":"2026-03-23T22:38:33.248Z","upstream":["CVE-2020-11080"],"database_specific":{"sources":[{"imported":"2026-03-23T22:20:24.429Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2020-11080","published":"2020-06-03T23:15:11.073Z","modified":"2024-11-21T04:56:44.657Z","id":"CVE-2020-11080","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11080"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html"},{"type":"WEB","url":"https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090"},{"type":"WEB","url":"https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394"},{"type":"WEB","url":"https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/"},{"type":"WEB","url":"https://www.debian.org/security/2020/dsa-4696"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujul2020.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuoct2020.html"},{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html"},{"type":"WEB","url":"https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090"},{"type":"WEB","url":"https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394"},{"type":"WEB","url":"https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/"},{"type":"WEB","url":"https://www.debian.org/security/2020/dsa-4696"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujul2020.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuoct2020.html"}],"affected":[{"package":{"name":"nghttp2_jll","ecosystem":"Julia","purl":"pkg:julia/nghttp2_jll?uuid=8e850ede-7688-5339-a07c-302acd2aaf8d"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.41.0+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1.json"}}],"schema_version":"1.7.5"}