{"id":"JLSEC-2026-241","summary":"Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary:...","details":"Issue summary: Checking excessively long DH keys or parameters may be very slow.\n\nImpact summary: Applications that use the functions DH_check(), DH_check_ex()\nor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\ndelays. Where the key or parameters that are being checked have been obtained\nfrom an untrusted source this may lead to a Denial of Service.\n\nThe function DH_check() performs various checks on DH parameters. After fixing\nCVE-2023-3446 it was discovered that a large q parameter value can also trigger\nan overly long computation during some of these checks. A correct q value,\nif present, cannot be larger than the modulus p parameter, thus it is\nunnecessary to perform these checks if q is larger than p.\n\nAn application that calls DH_check() and supplies a key or parameters obtained\nfrom an untrusted source could be vulnerable to a Denial of Service attack.\n\nThe function DH_check() is itself called by a number of other OpenSSL functions.\nAn application calling any of those other functions may similarly be affected.\nThe other functions affected by this are DH_check_ex() and\nEVP_PKEY_param_check().\n\nAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\nwhen using the \"-check\" option.\n\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\n\nThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.","modified":"2026-04-27T20:32:30.631037336Z","published":"2026-04-27T18:33:55.942Z","upstream":["CVE-2023-3817","EUVD-2023-44449","GHSA-c945-cqj5-wfv6"],"database_specific":{"sources":[{"published":"2023-07-31T16:15:10.497Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2023-3817","modified":"2025-05-05T16:15:47.343Z","imported":"2026-04-27T16:32:45.271Z","id":"CVE-2023-3817","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3817","database_specific":{"status":"Modified"}},{"published":"2023-07-31T18:30:22Z","id":"GHSA-c945-cqj5-wfv6","url":"https://api.github.com/advisories/GHSA-c945-cqj5-wfv6","imported":"2026-04-27T16:35:25.732Z","html_url":"https://github.com/advisories/GHSA-c945-cqj5-wfv6","modified":"2024-10-14T15:31:49Z"},{"published":"2023-07-31T15:34:13Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2023-44449","imported":"2026-04-27T16:33:16.722Z","id":"EUVD-2023-44449","modified":"2025-05-05T15:53:49Z","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-44449"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"http://seclists.org/fulldisclosure/2023/Jul/43"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2023/07/31/1"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2023/09/22/11"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2023/09/22/9"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2023/11/06/2"},{"type":"WEB","url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5"},{"type":"WEB","url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644"},{"type":"WEB","url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f"},{"type":"WEB","url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5"},{"type":"WEB","url":"https://github.com/advisories/GHSA-c945-cqj5-wfv6"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/08/msg00019.html"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3817"},{"type":"WEB","url":"https://security.gentoo.org/glsa/202402-08"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20230818-0014"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20230818-0014/"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20231027-0008"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20231027-0008/"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20240621-0006"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20240621-0006/"},{"type":"WEB","url":"https://www.openssl.org/news/secadv/20230731.txt"}],"affected":[{"package":{"name":"OpenSSL_jll","ecosystem":"Julia","purl":"pkg:julia/OpenSSL_jll?uuid=458c3c95-2e84-50aa-8efc-19380b2a3a95"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.1.22+0"},{"introduced":"3.0.8+0"},{"fixed":"3.0.10+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-241.json"}},{"package":{"name":"Openresty_jll","ecosystem":"Julia","purl":"pkg:julia/Openresty_jll?uuid=87da34d4-7b1b-5a94-8376-8cb65bf3132c"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.27.1+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-241.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}