CVE-2026-70453

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{"bugzilla": {"description": "rsync: rsync: Denial of Service via Algorithmic Complexity", "id": "2515403", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515403"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["rsync before 3.5.0\u00a0contains 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.", "A flaw was found in rsync. A remote attacker can exploit an algorithmic complexity vulnerability within the `hash_search()` function by sending a specially crafted file list. This can lead to the exhaustion of the receiver's CPU resources, causing a sustained denial of service (DoS)."], "mitigation": {"lang": "en:us", "value": "Disable unused rsyncd services (systemctl disable --now rsyncd), or restrict daemon access to trusted clients via hosts allow and firewall rules. Avoid synchronizing with untrusted senders or pushing to untrusted receivers and upload modules to prevent processing malicious file lists. To contain potential Denial of Service, enforce CPU resource limits on rsync processes using systemd cgroups or ulimit -t to prevent a quadratic search walk from starving the host."}, "name": "CVE-2026-70453", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-13T14:46:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-70453\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-70453\nhttps://github.com/RsyncProject/rsync/releases/tag/v3.5.0\nhttps://github.com/RsyncProject/rsync/security/advisories/GHSA-8x5r-mjx8-83hv\nhttps://www.vulncheck.com/advisories/rsync-algorithmic-complexity-dos-via-hash-search"], "statement": "This Moderate flaw in rsync's `hash_search()` function allows a remote attacker to cause a denial of service. By sending a specially crafted file list, an attacker can exhaust the receiver's CPU resources, leading to service unavailability. This is particularly relevant in Red Hat environments where rsync is used for remote file synchronization and may be exposed to untrusted networks.", "threat_severity": "Moderate"}

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