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CVE-2026-45232— Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy

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 3.4.3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。

CVSS 3.1 · Low EPSS 0.35% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-45232

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Vendor Advisories for CVE-2026-45232 (2)

Vendor Pages for CVE-2026-45232 (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-2026-43619 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
Same vendor: RsyncProject
Same weakness: CWE-193

V. Comments for CVE-2026-45232

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