{"id":"JLSEC-2026-631","summary":"Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in...","details":"Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in `recv_files()` in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting `CF_INC_RECURSE` in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without `ITEM_TRANSFER`, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.","modified":"2026-07-25T18:23:57.976980126Z","published":"2026-06-25T17:41:14.392Z","upstream":["CVE-2026-43620","GHSA-jmf6-74r8-6c28","EUVD-2026-31012"],"database_specific":{"license":"CC-BY-4.0","sources":[{"modified":"2026-07-14T21:16:53.240Z","published":"2026-05-20T02:16:36.727Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-43620","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43620","database_specific":{"status":"Analyzed"},"id":"CVE-2026-43620","imported":"2026-07-17T22:15:29.828Z"},{"imported":"2026-07-17T22:15:29.988Z","modified":"2026-05-20T03:31:41Z","published":"2026-05-20T03:31:33Z","url":"https://api.github.com/advisories/GHSA-jmf6-74r8-6c28","html_url":"https://github.com/advisories/GHSA-jmf6-74r8-6c28","id":"GHSA-jmf6-74r8-6c28"},{"imported":"2026-07-17T22:15:38.031Z","modified":"2026-07-14T20:01:07Z","published":"2026-05-20T00:47:57Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-31012","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-31012","id":"EUVD-2026-31012"}]},"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-28pw-r563-rxvm"},{"type":"WEB","url":"https://github.com/advisories/GHSA-jmf6-74r8-6c28"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43620"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/rsync-out-of-bounds-array-read-via-recv-files"}],"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-2026-631.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}