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CVE-2026-70463— rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing

Quick assessment

Affected
RsyncProject rsync
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RsyncProject Rsync是RsyncProject组织开源的一款速度快、功能极其强大的文件复制工具，可用于复制远程文件和本地文件。 RsyncProject Rsync 3.1.0版本至3.5.0之前版本存在授权问题漏洞，该漏洞源于auth users指令解析时仅使用逗号分隔用户列表，无法正确处理包含空格的@Group Name条目，导致拒绝规则被静默丢弃，已认证用户可连接到受限模块，造成授权绕过。

CVSS 8.1 · High EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services

Affected Version Matrix 2

VendorProduct Version RangeStatus
RsyncProject rsync 3.1.0≤ 3.4.4 affected
3.5.0 unaffected
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I. Basic Information for CVE-2026-70463

Vulnerability Information
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Vulnerability Title
rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
rsync 3.1.0 before 3.5.0 contains an authorization bypass in auth users directive parsing. The auth users parser uses comma-only tokenization when splitting the user list, which fails to correctly handle entries of the form @Group Name where the group name contains a space. The space within the group name causes the parser to split the entry at the space boundary, discarding the deny rule associated with the group. An authenticated user whose username or group membership would be denied by an @Group Name auth users entry can connect to a restricted module because the deny rule is silently discarded during parsing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
RsyncProject Rsync 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RsyncProject Rsync是RsyncProject组织开源的一款速度快、功能极其强大的文件复制工具，可用于复制远程文件和本地文件。 RsyncProject Rsync 3.1.0版本至3.5.0之前版本存在授权问题漏洞，该漏洞源于auth users指令解析时仅使用逗号分隔用户列表，无法正确处理包含空格的@Group Name条目，导致拒绝规则被静默丢弃，已认证用户可连接到受限模块，造成授权绕过。
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 3.1.0 ~ 3.4.4 -

II. Public POCs for CVE-2026-70463

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Qwen3.6-35B-A3B · 13421 chars
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III. Intelligence Information for CVE-2026-70463

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Vendor Advisories for CVE-2026-70463 (2)

Vendor Pages for CVE-2026-70463 (1)

Same Patch Batch · RsyncProject · 2026-08-13 · 33 CVEs total

CVE-2026-53791 9.1 CRITICAL rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
CVE-2026-70461 8.2 HIGH rsync 3.2.5 < 3.5.0 Heap Out-of-Bounds Write via files-from Entry
CVE-2026-70456 8.2 HIGH rsync 3.0.1 < 3.5.0 Heap Out-of-Bounds Write via read_args()
CVE-2026-70458 8.2 HIGH rsync 3.0.0 < 3.5.0 Out-of-Bounds Write via FLAG_HLINKED Handling
CVE-2026-53790 8.1 HIGH rsync < 3.5.0 Command Injection via Multiple Code Paths
CVE-2026-53795 8.1 HIGH rsync < 3.5.0 Arbitrary File Write via --temp-dir/--link-dest
CVE-2026-70460 8.1 HIGH rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink
CVE-2026-53783 8.1 HIGH rsync < 3.5.0 TOCTOU Race Condition Directory Escape via rrsync
CVE-2026-70454 8.0 HIGH rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/OpenSSL Mode
CVE-2026-53803 7.8 HIGH rsync < 3.5.0 Symlink Following Arbitrary File Overwrite
CVE-2026-70455 7.5 HIGH rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Thread Exhaustion
CVE-2026-70464 7.5 HIGH rsync 2.0.0 < 3.5.0 Connection Slot Exhaustion DoS via Handshake Stall
CVE-2026-70453 7.5 HIGH rsync < 3.5.0 Algorithmic Complexity DoS via hash_search()
CVE-2026-53793 7.4 HIGH rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode
CVE-2026-70452 7.4 HIGH rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure
CVE-2026-53802 7.1 HIGH rsync < 3.5.0 Arbitrary File Read via Symlink Following
CVE-2026-53785 7.1 HIGH rsync < 3.5.0 Path Traversal Write Escape via --relative Mode
CVE-2026-53784 7.1 HIGH rsync < 3.5.0 Path Traversal via Symlink Module Root
CVE-2026-70462 6.5 MEDIUM rsync 3.1.0 < 3.5.0 Signed Integer Overflow via MSG_IO_TIMEOUT
CVE-2026-70457 6.5 MEDIUM rsync 3.2.3 < 3.5.0 Out-of-Bounds Write via parse_size_arg()

Showing top 20 of 33 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: rsync
Same vendor: RsyncProject
Same weakness: CWE-863

V. Comments for CVE-2026-70463

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