CVE-2026-29518— Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arbitrary File Write
Possible ATT&CK Techniques 3AI
T1055 · Process Injection T1068 · Exploitation for Privilege Escalation T1564.004 · NTFS File AttributesAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RsyncProject | rsync | < 3.4.3 | affected |
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I. Basic Information for CVE-2026-29518
Vulnerability Information
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Vulnerability Title
Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arbitrary File Write
Source: NVD (National Vulnerability Database)
Vulnerability Description
Rsync versions before 3.4.3 contain a time-of-check to time-of-use (TOCTOU) race condition in daemon file handling that allows attackers to redirect file writes outside intended directories by replacing parent directory components with symbolic links. Attackers with write access to a module path can exploit this race condition to create or overwrite arbitrary files, potentially modifying sensitive system files and achieving privilege escalation when the daemon runs with elevated privileges. This vulnerability can only be triggered if the chroot setting is false.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| RsyncProject | rsync | 0 ~ 3.4.3 | - |
II. Public POCs for CVE-2026-29518
| # | POC Description | Source Link | Shenlong Link |
|---|
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Qwen3.6-35B-A3B · 10161 chars
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III. Intelligence Information for CVE-2026-29518
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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-2026-43620 | 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-2026-43617 | 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
- CVE-2026-43617
Rsync < 3.4.3 Authorization Bypass via Hostname Resolution - 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-2026-43617
Rsync < 3.4.3 Authorization Bypass via Hostname Resolution - 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-367
V. Comments for CVE-2026-29518
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