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CVE-2026-43620— Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()

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及之前版本存在缓冲区错误漏洞，该漏洞源于receiver.c中recv_files函数存在接收端数组越界读取，恶意服务器可通过特制文件列表导致客户端进程崩溃。

CVSS 6.5 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
RsyncProject rsync < 3.4.3 affected
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I. Basic Information for CVE-2026-43620

Vulnerability Information
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Vulnerability Title
Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()
Source: CVE Program / CVE List V5
Vulnerability Description
Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recv_files() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CF_INC_RECURSE in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Rsync 缓冲区错误漏洞
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及之前版本存在缓冲区错误漏洞，该漏洞源于receiver.c中recv_files函数存在接收端数组越界读取，恶意服务器可通过特制文件列表导致客户端进程崩溃。
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-2026-43620

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III. Intelligence Information for CVE-2026-43620

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Vendor Advisories for CVE-2026-43620 (2)

Vendor Pages for CVE-2026-43620 (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-2026-43619 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
Same vendor: RsyncProject
Same weakness: CWE-125

V. Comments for CVE-2026-43620

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