CVE-2026-43617— Rsync < 3.4.3 Authorization Bypass via Hostname Resolution
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RsyncProject | rsync | < 3.4.3 | affected |
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I. Basic Information for CVE-2026-43617
Vulnerability Information
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Vulnerability Title
Rsync < 3.4.3 Authorization Bypass via Hostname Resolution
Source: NVD (National Vulnerability Database)
Vulnerability Description
Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname-based deny rules by controlling the PTR record for their source IP address, allowing connections from hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用候选名称进行的认证绕过
Source: NVD (National Vulnerability Database)
Vulnerability Title
Rsync 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rsync是RsyncProject开源的一款快速且用途广泛的文件复制工具。用于远程文件和本地文件。 Rsync 3.4.2及之前版本存在安全漏洞，该漏洞源于基于主机名的访问控制列表在配置chroot时存在授权绕过，攻击者可通过控制PTR记录绕过基于主机名的拒绝规则。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| RsyncProject | rsync | 0 ~ 3.4.3 | - |
II. Public POCs for CVE-2026-43617
| # | POC Description | Source Link | Shenlong Link |
|---|
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Advisory · 2Vendor · 1
- Release v3.4.3 · RsyncProject/rsync · GitHubrelease-notes
- https://nvd.nist.gov/vuln/detail/CVE-2026-43617
Same Patch Batch · RsyncProject · 2026-05-20 · 6 CVEs total
| CVE-2026-43618 | 8.1 HIGH | Rsync < 3.4.3 Integer Overflow Information Disclosure |
| CVE-2026-29518 | 7.0 HIGH | Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arbitrary File Write |
| CVE-2026-43620 | 6.5 MEDIUM | Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files() |
| CVE-2026-43619 | 6.3 MEDIUM | Rsync < 3.4.3 Symlink Race Condition via Path-Based Syscalls |
| CVE-2026-45232 | 3.1 LOW | Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy |
IV. Related Vulnerabilities
Same product: rsync
- CVE-2026-29518
Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arb - CVE-2026-43618
Rsync < 3.4.3 Integer Overflow Information Disclosure - CVE-2026-43619
Rsync < 3.4.3 Symlink Race Condition via Path-Based Syscalls - CVE-2026-43620
Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files() - CVE-2026-45232
Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy
Same vendor: RsyncProject
- CVE-2026-29518
Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arb - CVE-2026-43618
Rsync < 3.4.3 Integer Overflow Information Disclosure - CVE-2026-43619
Rsync < 3.4.3 Symlink Race Condition via Path-Based Syscalls - CVE-2026-43620
Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files() - CVE-2026-45232
Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy
Same weakness: CWE-289
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Util-linux: util-linux: access control bypass due to imprope - CVE-2026-32036
OpenClaw < 2026.2.26- Authentication Bypass via Encoded Dot- - CVE-2026-23903
Apache Shiro: Auth bypass when accessing static files only o - CVE-2026-24058
Soft Serve has Critical Authentication Bypass - CVE-2025-14777
Keycloak: keycloak idor in realm client creating/deleting
V. Comments for CVE-2026-43617
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