CVE-2026-45232— Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy
Possible ATT&CK Techniques 2AI
T1190 · Exploit Public-Facing Application T1203 · Exploitation for Client ExecutionAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RsyncProject | rsync | < 3.4.3 | affected |
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I. Basic Information for CVE-2026-45232
Vulnerability Information
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Vulnerability Title
Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy
Source: NVD (National Vulnerability Database)
Vulnerability Description
Rsync versions before 3.4.3 contain an off-by-one out-of-bounds stack write vulnerability in the establish_proxy_connection() function in socket.c that allows network attackers to corrupt stack memory by sending a malformed HTTP proxy response. Attackers can exploit this by positioning themselves between the client and proxy or controlling the proxy server to send a response line of 1023 or more bytes without a newline terminator, causing a null byte to be written to an out-of-bounds stack address when the RSYNC_PROXY environment variable is set.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
Off-by-one错误
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 3.4.3之前版本存在安全漏洞，该漏洞源于establish_proxy_connection函数中存在差一越界栈写入，网络攻击者可通过发送畸形HTTP代理响应破坏栈内存。
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-2026-45232
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-45232 (2)
- Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy | Advisories | VulnCheckthird-party-advisory
Vendor Pages for CVE-2026-45232 (1)
- Release v3.4.3 · RsyncProject/rsync · GitHubrelease-notes
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-2026-43617 | 4.8 MEDIUM | Rsync < 3.4.3 Authorization Bypass via Hostname Resolution |
IV. Related Vulnerabilities
Same product: rsync
- CVE-2026-29518
Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arb - 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()
Same vendor: RsyncProject
- CVE-2026-29518
Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arb - 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()
V. Comments for CVE-2026-45232
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