CVE-2026-43620— Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()
Possible ATT&CK Techniques 1AI
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-2026-43620
Vulnerability Information
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Vulnerability Title
Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-43620 (2)
- Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files() | Advisories | VulnCheckthird-party-advisory
Vendor Pages for CVE-2026-43620 (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-2026-43619 | 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-2026-29518
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-2026-45232
Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy
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-2026-45232
Rsync < 3.4.3 Off-by-One Stack Write via HTTP Proxy
Same weakness: CWE-125
- CVE-2026-9504
GNU LibreDWG Dwggrep Utility dwggrep.c bit_convert_TU out-of - CVE-2026-41071
libheif: Heap buffer over-read in SampleAuxInfoReader via cr - CVE-2026-41069
libheif allows Out-of-bounds vector access leading to invali - CVE-2026-44067
EA header parsing heap over-read - CVE-2026-44066
Heap out-of-bounds reads in Spotlight RPC unmarshalling
V. Comments for CVE-2026-43620
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