{"id":"JLSEC-2026-632","details":"Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.","modified":"2026-06-25T17:45:04.031033474Z","published":"2026-06-25T17:41:14.392Z","upstream":["CVE-2026-45232","EUVD-2026-31009"],"database_specific":{"sources":[{"id":"CVE-2026-45232","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45232","modified":"2026-06-17T10:51:48.753Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-45232","published":"2026-05-20T02:16:36.887Z","imported":"2026-06-25T17:27:23.373Z","database_specific":{"status":"Analyzed"}},{"id":"EUVD-2026-31009","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-31009","modified":"2026-05-20T17:31:52Z","imported":"2026-06-25T17:27:24.675Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-31009","published":"2026-05-20T00:45:28Z"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://github.com/RsyncProject/rsync/releases/tag/v3.4.3"},{"type":"WEB","url":"https://github.com/RsyncProject/rsync/security/advisories/GHSA-8f85-j2cv-59m8"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/rsync-off-by-one-stack-write-via-http-proxy"}],"affected":[{"package":{"name":"rsync_jll","ecosystem":"Julia","purl":"pkg:julia/rsync_jll?uuid=191d6b87-264a-55f5-a0e2-c8fbce9a1ce0"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.4.4+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-632.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}