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CVE-2026-35025 is a high-severity access control bypass vulnerability in ProFTPD affecting versions through 1.3.9b and 1.3.10rc2. The flaw is in handling of the RNFR command, where an authenticated FTP user can prefix a path with /proc/self/root to bypass Directory ACL restrictions. The issue stems from unresolved symlink components in dir_canonical_path(), which leads dir_check() to perform lexical path comparisons that do not match configured Directory blocks. As a result, access controls intended to protect DenyAll-restricted directories can be bypassed, allowing unauthorized rename operations against files in those protected locations and enabling later retrieval of the affected files.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An access control bypass vulnerability in ProFTPD FTP that could lead to unauthorized file operations.
A vulnerability in ProFTPD FTP server that may allow unauthorized file operations via access control bypass.
An access control bypass vulnerability in ProFTPD FTP server that can lead to unauthorized file operations.
An authentication or access-control bypass vulnerability in ProFTPD FTP server that could allow unauthorized file operations, mentioned in related news.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.