CVE-2026-70457— rsync 3.2.3 < 3.5.0 Out-of-Bounds Write via parse_size_arg()
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.
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 3.2.3至3.5.0之前版本存在缓冲区错误漏洞，该漏洞源于parse_size_arg()函数在格式化大小字符串时未进行边界检查，将snprintf()的返回值直接用作.bss段数组索引，导致越界写入，可能破坏.bss内存。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RsyncProject | rsync | 3.2.3≤ 3.4.4 |
affected |
3.5.0 |
unaffected |
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I. Basic Information for CVE-2026-70457
Vulnerability Information
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Vulnerability Title
rsync 3.2.3 < 3.5.0 Out-of-Bounds Write via parse_size_arg()
Source: CVE Program / CVE List V5
Vulnerability Description
rsync 3.2.3 before 3.5.0 contains an out-of-bounds write in parse_size_arg() where the return value of snprintf() is used directly as an index into a .bss-segment array without bounds checking. When snprintf truncates the formatted size string, the return value equals the number of characters that would have been written including the truncated portion, and this value may exceed the array length. The subsequent indexed write targets memory outside the intended array bounds, corrupting .bss memory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区大小计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
RsyncProject Rsync 缓冲区错误漏洞
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 3.2.3至3.5.0之前版本存在缓冲区错误漏洞，该漏洞源于parse_size_arg()函数在格式化大小字符串时未进行边界检查，将snprintf()的返回值直接用作.bss段数组索引，导致越界写入，可能破坏.bss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 | 3.2.3 ~ 3.4.4 | - |
|
II. Public POCs for CVE-2026-70457
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-70457 (2)
Vendor Pages for CVE-2026-70457 (1)
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🔗 Release v3.5.0 · RsyncProject/rsync · GitHub release-notes
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-2026-70463 | 8.1 HIGH | rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing |
| CVE-2026-53795 | 8.1 HIGH | rsync < 3.5.0 Arbitrary File Write via --temp-dir/--link-dest |
| CVE-2026-53783 | 8.1 HIGH | rsync < 3.5.0 TOCTOU Race Condition Directory Escape via rrsync |
| CVE-2026-70460 | 8.1 HIGH | rsync 2.3.3 < 3.5.0 Path Traversal via --partial-dir/--backup-dir Symlink |
| 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-2026-53784 | 7.1 HIGH | rsync < 3.5.0 Path Traversal via Symlink Module Root |
| CVE-2026-53785 | 7.1 HIGH | rsync < 3.5.0 Path Traversal Write Escape via --relative Mode |
| CVE-2026-53802 | 7.1 HIGH | rsync < 3.5.0 Arbitrary File Read via Symlink Following |
| CVE-2026-53789 | 6.5 MEDIUM | rsync < 3.5.0 Arbitrary File Deletion via Malicious File List |
Showing top 20 of 33 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: rsync
-
CVE-2026-70452
rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution -
CVE-2026-70453
rsync < 3.5.0 Algorithmic Complexity DoS via hash_search() -
CVE-2026-70454
rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/Open -
CVE-2026-70455
rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Threa -
CVE-2026-70456
rsync 3.0.1 < 3.5.0 Heap Out-of-Bounds Write via read_args()
Same vendor: RsyncProject
-
CVE-2026-70452
rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution -
CVE-2026-70453
rsync < 3.5.0 Algorithmic Complexity DoS via hash_search() -
CVE-2026-70454
rsync < 3.5.0 TLS Certificate Validation Bypass via SSL/Open -
CVE-2026-70455
rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Threa -
CVE-2026-70456
rsync 3.0.1 < 3.5.0 Heap Out-of-Bounds Write via read_args()
Same weakness: CWE-131
V. Comments for CVE-2026-70457
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