{"id":"CVE-2026-44510","summary":"Rsync: Receiver-side out-of-bounds read enables remote DoS from malicious server","details":"Rsync is a file-copying tool that uses a delta-transfer algorithm to synchronize remote and local files. In versions prior to 3.4.3, the receiver-side out-of-bounds array read in rsync's recv_files() lets a malicious rsync server (or any peer acting in the sender role) deterministically crash any rsync client that pulls from it. The trigger is fully wire-protocol-level, requires no special options on the victim, and works for both rsync:// URLs and remote-shell pulls; since inc_recurse is the protocol-30+ default, any client doing a normal recursive pull against an attacker-controlled URL is exposed. A malicious server sets CF_INC_RECURSE, sends a flist whose first sorted entry is not the leading \".\" directory (causing parent_ndx to be set to -1), then sends a transfer record with ndx = 0 and an iflag omitting ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference the result in f_name(). The impact is crash-only: the out-of-bounds read lands in glibc mmap chunk metadata and dereferences to an unmapped low address, producing a SEGV that cannot be leveraged into an exploit (confirmed on glibc x86-64 Linux; non-glibc allocators not audited). This issue is fixed in version 3.4.3.","aliases":["CVE-2026-43620","GHSA-28pw-r563-rxvm"],"modified":"2026-09-10T18:27:09.946405995Z","published":"2026-07-20T21:03:17.056Z","related":["SUSE-SU-2026:23289-1","SUSE-SU-2026:23323-1","openSUSE-SU-2026:21650-1"],"database_specific":{"cwe_ids":["CWE-125"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44510.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44510.json"},{"type":"ADVISORY","url":"https://github.com/RsyncProject/rsync/security/advisories/GHSA-28pw-r563-rxvm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44510"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rsyncproject/rsync","events":[{"introduced":"0"},{"fixed":"2c7777aaa62abeb1bca192da345e6e8c685e872a"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"3.4.3"}],"source":"AFFECTED_FIELD"}}],"versions":["v3.2.7","v3.4.1","v3.4.2","v3.4.0","v3.3.0","v3.3.0pre1","v3.2.7pre1","v3.2.6","v3.2.5","v3.2.5pre2","v3.2.5pre1","v3.2.4","v3.2.4pre4","v3.2.4pre3","v3.2.4pre2","v3.2.4pre1","v3.2.3","v3.2.3pre1","v3.2.2","v3.2.2pre3","v3.2.2pre2","v3.2.2pre1","v3.2.1","v3.2.1pre1","v3.2.0","v3.2.0pre3","v3.2.0pre2","v3.2.0pre1","v3.1.3","v3.1.3pre1","v3.1.2","v3.1.2pre1","v3.1.1","v3.1.1pre2","v3.1.1pre1","v3.1.0","v3.1.0pre1","v3.0.3","v3.0.3pre3","v3.0.3pre2","v3.0.3pre1","v3.0.2","v3.0.1","v3.0.1pre3","v3.0.1pre2","v3.0.1pre1","v3.0.0","v3.0.0pre10","v3.0.0pre9","v3.0.0pre8","v3.0.0pre7","v3.0.0pre6","v3.0.0pre5","v3.0.0pre4","v3.0.0pre3","v3.0.0pre2","v3.0.0pre1","v2.6.9","v2.6.9pre3","v2.6.9pre2","v2.6.9pre1","v2.6.8","v2.6.8pre1","v2.6.7","v2.6.7pre3","v2.6.7pre2","v2.6.7pre1","v2.6.6pre1","v2.6.5","v2.6.5pre2","v2.6.5pre1","v2.6.4","v2.6.4pre4","v2.6.4pre3","v2.6.4pre2","v2.6.4pre1","v2.6.3","v2.6.3pre2","v2.6.3pre1","v2.6.2","v2.6.2pre1","v2.6.1","v2.6.1pre2","v2.6.1pre1","v2.6.0","v2.6.0pre2","v2.6.0pre1","v2.5.6","v2.5.5","v2.5.5.rc1","v2.5.4","v2.5.4pre1","v2.5.3","v2.5.3pre1","v2.5.2","v2.5.2pre3","v2.5.2pre2","v2.5.2pre1","v2.5.1","v2.5.1pre3","v2.5.1pre2","v2.5.1pre1","v2.5.0","v2.4.7pre4","v2.4.7pre2","mbp_bk_export0","v2.4.6","v2.4.5","v2.4.4","v2.4.3","v2.4.2","v2.4.1","v2.4.0","v2.3.2","v2.3.1","v2.3.0","v2.2.1","v2.2.0","v2.1.1","v2.1.0","v2.0.19","v2.0.18","v2.0.17","v2.0.16","v2.0.15","v2.0.14","v2.0.13","v2.0.12","v2.0.11","v2.0.10","v2.0.9","v2.0.8","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v1.7.4","v1.7.3","v1.7.2","v1.7.1","v1.7.0","v1.6.9","v1.6.8","v1.6.7","v1.6.6","v1.6.5","v1.6.4"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-44510.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}