ProFTPD ACL Bypass via /proc/self/root Path Prefix in RNFR (CVE-2026-35025) | HOL Guard CVE

High · CVSS 8.1CVE-2026-35025

ProFTPD ACL Bypass via /proc/self/root Path Prefix in RNFR

Answer in brief

CVE-2026-35025 records a High severity (CVSS 8.1) vulnerability in ProFTPD ACL Bypass via /proc/self/root Path Prefix in RNFR. The current sources do not mark it as known exploited. The current feed maps ProFTPD Project/ProFTPD (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 24, 2026Updated Jul 14, 2026Source checked Sep 19, 2026First seen by HOL Jun 24, 2026Material review Jul 14, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ProFTPD Project/ProFTPD (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
ProFTPD Project/ProFTPDgeneric	0 \|\| 0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for ProFTPD Project/ProFTPD.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 24, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.