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{"bugzilla": {"description": "rsync: rsync: Remote Denial of Service via Out-of-bounds Read", "id": "2469057", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2469057"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in rsync. A malicious rsync server can exploit an out-of-bounds read vulnerability in the `recv_files()` function. By manipulating compatibility flags and transfer records, the server can cause a connecting client to attempt to read memory outside of allocated bounds. This can lead to a segmentation fault, resulting in a denial of service for the client."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, rsync clients can be configured to disable incremental recursion when pulling from untrusted sources. This can be achieved by using the `--no-inc-recursive` option.\nExample:\n`rsync --no-inc-recursive [OPTIONS] SOURCE DESTINATION`\nDisabling incremental recursion may affect the efficiency of transfers for large, frequently updated directories."}, "name": "CVE-2026-43620", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-05-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43620\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43620"], "statement": "This Moderate impact flaw in rsync clients allows a remote, unauthenticated attacker to cause a denial-of-service by crafting a malicious rsync server. When a client pulls from such a server, an out-of-bounds read occurs due to an incomplete fix, leading to a deterministic crash. This affects any rsync client performing a normal pull from an attacker-controlled URL, as the `inc_recurse` option, which is enabled by default, facilitates the exploit.", "threat_severity": "Moderate"}

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