{"id":"CVE-2026-70453","title":"rsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that allows a remote attacker to cause a denial of service by delivering a carefully constructed file list","summary":"rsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that allows a remote attacker to cause a denial of service by delivering a carefully constructed file list. A sender can exploit the quadra…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-407","CWE-770"],"published":"2026-08-13","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:28:37.587","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70453","references":[{"url":"https://github.com/RsyncProject/rsync/releases/tag/v3.5.0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/RsyncProject/rsync/security/advisories/GHSA-8x5r-mjx8-83hv","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/rsync-algorithmic-complexity-dos-via-hash-search","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-70453.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-70453"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2515403"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-70453"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70453"},{"url":"https://access.redhat.com/errata/RHSA-2026:67463"},{"url":"https://access.redhat.com/errata/RHSA-2026:67462"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00525,"epssPercentile":0.43511,"ingestedAt":"2026-09-08T21:11:12.277Z","vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","affected":["enterprise_linux 6","enterprise_linux 7","enterprise_linux 8","openshift_container_platform 4","enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9"],"patched":["enterprise_linux_appstream_v_10","enterprise_linux_appstream_v_9","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_9"],"scores":{"nvd":7.5,"vendor":6.5},"slug":"CVE-2026-70453","body":"## Overview\n\nrsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that allows a remote attacker to cause a denial of service by delivering a carefully constructed file list. A sender can exploit the quadratic-time worst-case behavior in hash lookups to exhaust receiver CPU resources with a modest number of crafted entries, causing a sustained denial of service.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:67463** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67463)\n- **RHSA-2026:67462** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67462)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-70453.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}