CVE-2026-43619

Rsync version 3.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/RsyncProject/rsync/releases/tag/v3.4.3	Release Notes
https://github.com/RsyncProject/rsync/security/advisories/GHSA-4h9m-w5ff-j735	Vendor Advisory
https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-path-based-syscalls	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-20 02:16

Updated : 2026-07-24 09:10

NVD link : CVE-2026-43619

Mitre link : CVE-2026-43619

CVE.ORG link : CVE-2026-43619

JSON object : View

Products Affected

samba

rsync

CWE

CWE-59

Improper Link Resolution Before File Access ('Link Following')

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

{"id": "CVE-2026-43619", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43619", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-05-20T13:09:05.654709Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.3, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 1.0}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.2, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"repo": "https://github.com/RsyncProject/rsync", "vendor": "RsyncProject", "product": "rsync", "versions": [{"status": "affected", "version": "0", "lessThan": "3.4.3", "versionType": "semver"}], "packageURL": "pkg:github/RsyncProject/rsync", "defaultStatus": "unaffected"}]}], "published": "2026-05-20T02:16:36.577", "references": [{"url": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3", "tags": ["Release Notes"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-4h9m-w5ff-j735", "tags": ["Vendor Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-path-based-syscalls", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-59"}, {"lang": "en", "value": "CWE-367"}]}], "descriptions": [{"lang": "en", "value": "Rsync version\u00a03.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'."}, {"lang": "es", "value": "Rsync versi\u00f3n 3.4.2 y anteriores contienen vulnerabilidades de condici\u00f3n de carrera de symlink en llamadas al sistema basadas en rutas, incluyendo chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir y lstat, que permiten a atacantes locales redirigir operaciones a archivos fuera del m\u00f3dulo rsync exportado. Atacantes con acceso al sistema de archivos local pueden explotar la ventana de tiempo entre la resoluci\u00f3n de la ruta y la ejecuci\u00f3n de la llamada al sistema intercambiando symlinks para aplicar permisos, propiedad, marcas de tiempo o nombres de archivo proporcionados por el remitente a archivos arbitrarios fuera del l\u00edmite del m\u00f3dulo previsto en demonios rsync configurados con 'use chroot = no'."}], "lastModified": "2026-07-24T09:10:00.153", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EC81F4B6-4EC5-433C-9709-E4B9E340C65A", "versionEndIncluding": "3.4.2"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}