{"id":"JLSEC-2026-517","details":"An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's `src/xpub.cpp` in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability.","modified":"2026-07-25T18:25:11.621981755Z","published":"2026-05-20T04:02:19.667Z","upstream":["CVE-2021-20237"],"database_specific":{"sources":[{"database_specific":{"status":"Modified"},"id":"CVE-2021-20237","imported":"2026-07-17T22:03:22.850Z","modified":"2026-06-17T03:33:31.573Z","published":"2021-05-28T11:15:07.970Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-20237","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20237"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1921989"},{"type":"WEB","url":"https://github.com/zeromq/libzmq/security/advisories/GHSA-4p5v-h92w-6wxw"}],"affected":[{"package":{"name":"ZeroMQ_jll","ecosystem":"Julia","purl":"pkg:julia/ZeroMQ_jll?uuid=8f1865be-045e-5c20-9c9f-bfbfb0764568"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.3.4+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-517.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V2","score":"AV:N/AC:M/Au:N/C:N/I:N/A:P"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}