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CVE-2026-43619— Rsync < 3.4.3 Symlink Race Condition via Path-Based Syscalls

Quick assessment

Affected
RsyncProject rsync
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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及之前版本存在后置链接漏洞，该漏洞源于路径系统调用中存在符号链接竞争条件，本地攻击者可通过交换符号链接将操作重定向到导出模块外的文件。

CVSS 6.3 · Medium EPSS 0.13% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
RsyncProject rsync < 3.4.3 affected
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I. Basic Information for CVE-2026-43619

Vulnerability Information
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Vulnerability Title
Rsync < 3.4.3 Symlink Race Condition via Path-Based Syscalls
Source: CVE Program / CVE List V5
Vulnerability Description
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'.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
Rsync 后置链接漏洞
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及之前版本存在后置链接漏洞，该漏洞源于路径系统调用中存在符号链接竞争条件，本地攻击者可通过交换符号链接将操作重定向到导出模块外的文件。
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-2026-43619

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III. Intelligence Information for CVE-2026-43619

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Vendor Advisories for CVE-2026-43619 (2)

Vendor Pages for CVE-2026-43619 (1)

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-2026-43617 4.8 MEDIUM Rsync < 3.4.3 Authorization Bypass via Hostname Resolution
CVE-2026-45232 3.1 LOW Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy

IV. Related Vulnerabilities

Same product: rsync
Same vendor: RsyncProject
Same weakness: CWE-367

V. Comments for CVE-2026-43619

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