CVE-2026-119741

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{"bugzilla": {"description": "rsync: rsync: Denial of Service via crafted checksums during delta transfer", "id": "2566038", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2566038"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-407", "details": ["rsync before 3.5.2 contains a denial of service vulnerability in the delta-transfer sender's hash_search() in match.c that allows malicious receivers to trigger unbounded strong-checksum work at consecutive offsets. Unauthenticated attackers pulling from a public daemon module can supply weak checksums colliding with consecutive rolling windows plus non-matching strong checksums, exhausting sender CPU across concurrent connections.", "A flaw was found in rsync. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending crafted checksum sequences during delta file transfers to a public rsync server. This flaw forces the server to perform excessive checksum computations across consecutive data offsets, leading to high CPU resource exhaustion that degrades or disrupts availability for legitimate users."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-119741", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:rhel_els:6", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "rsync", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 5"}], "public_date": "2026-11-03T15:26:27Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-119741\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-119741\nhttps://github.com/RsyncProject/rsync\nhttps://github.com/RsyncProject/rsync/blob/a7404a9a633cff28ee1602f328b9c3fa69cdbd04/testsuite/hashsearch-collision-skip_test.py\nhttps://github.com/RsyncProject/rsync/commit/a7404a9a633cff28ee1602f328b9c3fa69cdbd04\nhttps://github.com/RsyncProject/rsync/pull/1132\nhttps://www.vulncheck.com/advisories/rsync-through-3.5.1-denial-of-service-via-hash-search-checksum-collisions"], "statement": "Red Hat has rated this vulnerability as Important because an unauthenticated remote attacker accessing a public rsync daemon module can trigger excessive CPU consumption during delta transfers. Repeated or concurrent malicious transfers can exhaust processing capacity and disrupt service for legitimate users. Exposure depends on serving files to untrusted receivers; systems that do not provide such access are not exposed to this unauthenticated attack scenario.", "threat_severity": "Important"}

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