CVE-2026-53792

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Attackers can send a specially crafted checksum set containing a zero-length block to cause a negative offset calculation during delta computation, resulting in an out-of-bounds read of file data buffer memory on the sender side."}, {"lang": "es", "value": "rsync anterior a la versi\u00f3n 3.5.0 contiene una vulnerabilidad de lectura fuera de l\u00edmites en la l\u00f3gica de coincidencia de bloques del lado del remitente que permite a un receptor malicioso activar el acceso a la memoria antes del inicio de un b\u00fafer asignado al enviar un bloque de suma de verificaci\u00f3n manipulado con una longitud de cero. Los atacantes pueden enviar un conjunto de suma de verificaci\u00f3n especialmente manipulado que contiene un bloque de longitud cero para causar un c\u00e1lculo de desplazamiento negativo durante la computaci\u00f3n delta, lo que resulta en una lectura fuera de l\u00edmites de la memoria del b\u00fafer de datos del archivo en el lado del remitente."}], "id": "CVE-2026-53792", "lastModified": "2026-11-06T16:00:43.863", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53792", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-14T15:55:27.241485Z", "version": "2.0.3"}}]}, "published": "2026-08-13T15:19:43.527", "references": [{"source": "disclosure@vulncheck.com", "tags": ["Release Notes"], "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0"}, {"source": "disclosure@vulncheck.com", "tags": ["Vendor Advisory"], "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-cg57-rp9g-56hw"}, {"source": "disclosure@vulncheck.com", "tags": ["Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/rsync-out-of-bounds-read-via-zero-length-checksum-block"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}, {"lang": "en", "value": "CWE-787"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "rsync: rsync: Denial of Service via out-of-bounds read with crafted checksum block", "id": "2515397", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515397"}, "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-129", "details": ["rsync\u00a0before 3.5.0\u00a0contains an out-of-bounds read vulnerability in the sender-side block matching logic that allows a malicious receiver to trigger memory access before the start of an allocated buffer by sending a crafted checksum block with a length of zero. Attackers can send a specially crafted checksum set containing a zero-length block to cause a negative offset calculation during delta computation, resulting in an out-of-bounds read of file data buffer memory on the sender side.", "A flaw was found in rsync. A malicious receiver can exploit an out-of-bounds read vulnerability in the sender-side block matching logic. By sending a specially crafted checksum block with a length of zero, an attacker can trigger memory access before the start of an allocated buffer. This can lead to a denial of service on the sender side."], "mitigation": {"lang": "en:us", "value": "Disable unused rsyncd services (systemctl disable --now rsyncd), and if actively serving files, restrict port 873 to trusted clients to prevent untrusted pull requests from crashing the daemon. When operating as a client, only push data (rsync src/ host:dst/) to fully trusted receivers, as the out-of-bounds read is triggered by the receiving end."}, "name": "CVE-2026-53792", "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": "2026-08-13T14:38:30Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53792\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53792\nhttps://github.com/RsyncProject/rsync/releases/tag/v3.5.0\nhttps://github.com/RsyncProject/rsync/security/advisories/GHSA-cg57-rp9g-56hw\nhttps://www.vulncheck.com/advisories/rsync-out-of-bounds-read-via-zero-length-checksum-block"], "statement": "A Moderate denial of service flaw exists in rsync, where a malicious receiver can trigger an out-of-bounds read on the sending system. This vulnerability requires the sender to connect to a specially crafted malicious rsync server, which can lead to service disruption of file synchronization operations.", "threat_severity": "Moderate"}

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