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CVE-2026-35025— ProFTPD ACL Bypass via /proc/self/root Path Prefix in RNFR

Quick assessment

Affected
ProFTPD Project ProFTPD
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.

ProFTPD是ProFTPD团队开源的一套可配置性强的开放源代码的FTP服务器软件。 ProFTPD 1.3.9b及之前版本和1.3.10rc2及之前版本存在后置链接漏洞，该漏洞源于RNFR命令处理程序中的路径前缀问题，允许经过身份验证的FTP用户通过前缀路径（/proc/self/root）绕过目录ACL限制，利用dir_canonical_path()中的未解析符号链接组件导致dir_check()执行不匹配配置的目录块的词法路径比较，从而对DenyAll保护的目录中的文件执行重命名操作并检索这些文

CVSS 8.1 · High EPSS 0.51% · P41

Affected Version Matrix 2

VendorProduct Version RangeStatus
ProFTPD Project ProFTPD ≤ 1.3.9b affected
≤ 1.3.10rc2 affected
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I. Basic Information for CVE-2026-35025

Vulnerability Information
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Vulnerability Title
ProFTPD ACL Bypass via /proc/self/root Path Prefix in RNFR
Source: CVE Program / CVE List V5
Vulnerability Description
ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL restrictions by prefixing paths with /proc/self/root in the RNFR command handler. Attackers can exploit the unresolved symlink components in dir_canonical_path() to cause dir_check() to perform lexical path comparisons that match no configured Directory block, enabling rename operations on files in DenyAll-protected directories and subsequent retrieval of those files. Mitigation: Sessions configured with DefaultRoot (chroot) are not affected, as chroot changes the directory to which /proc/self/root resolves.
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
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
proftpd 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ProFTPD是ProFTPD团队开源的一套可配置性强的开放源代码的FTP服务器软件。 ProFTPD 1.3.9b及之前版本和1.3.10rc2及之前版本存在后置链接漏洞，该漏洞源于RNFR命令处理程序中的路径前缀问题，允许经过身份验证的FTP用户通过前缀路径（/proc/self/root）绕过目录ACL限制，利用dir_canonical_path()中的未解析符号链接组件导致dir_check()执行不匹配配置的目录块的词法路径比较，从而对DenyAll保护的目录中的文件执行重命名操作并检索这些文
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
ProFTPD Project ProFTPD 0 ~ 1.3.9b -

II. Public POCs for CVE-2026-35025

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11926 chars
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-35025

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Vendor Advisories for CVE-2026-35025 (1)

Proof of Concept for CVE-2026-35025 (1)

IV. Related Vulnerabilities

Same product: ProFTPD
Same vendor: ProFTPD Project
Same weakness: CWE-59

V. Comments for CVE-2026-35025

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