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CVE-2026-70622— tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all()

Quick assessment

Affected
composefs tar-rs
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.

composefs tar-rs是composefs组织的一个归档文件处理库。 composefs tar-rs 0.4.11版本至0.4.46版本存在后置链接漏洞，该漏洞源于Builder::append_dir_all()函数存在符号链接逃逸问题，未验证符号链接解析目标是否在源根目录内，可能导致攻击者读取源根目录之外的文件。

CVSS 6.5 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
composefs tar-rs 0.4.11≤ 0.4.46 affected
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I. Basic Information for CVE-2026-70622

Vulnerability Information
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Vulnerability Title
tar-rs 0.4.11 - 0.4.46 Symlink Escape via append_dir_all()
Source: CVE Program / CVE List V5
Vulnerability Description
tar-rs versions 0.4.11 through 0.4.46 contain a symlink escape vulnerability in the Builder::append_dir_all() function that allows attackers to read files outside the intended source root directory by planting symlinks in an attacker-controlled directory. When a privileged process archives an untrusted directory, the function follows symlinks without verifying that resolved targets remain within the source root, causing out-of-bounds files to be included in the archive as regular files and disclosed to the attacker.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
composefs tar-rs 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
composefs tar-rs是composefs组织的一个归档文件处理库。 composefs tar-rs 0.4.11版本至0.4.46版本存在后置链接漏洞，该漏洞源于Builder::append_dir_all()函数存在符号链接逃逸问题，未验证符号链接解析目标是否在源根目录内，可能导致攻击者读取源根目录之外的文件。
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
composefs tar-rs 0.4.11 ~ 0.4.46 -

II. Public POCs for CVE-2026-70622

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III. Intelligence Information for CVE-2026-70622

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Vendor Advisories for CVE-2026-70622 (2)

IV. Related Vulnerabilities

Same product: tar-rs
Same weakness: CWE-59

V. Comments for CVE-2026-70622

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