CVE-2026-35025
ProFTPD ACL Bypass via /proc/self/root Path Prefix in RNFR
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.
INFO
Published Date :
June 24, 2026, 2:17 p.m.
Last Modified :
July 14, 2026, 9:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update ProFTPD to a non-vulnerable version.
- Ensure Directory ACLs are correctly configured.
- Configure sessions with DefaultRoot (chroot).
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-35025.
| URL | Resource |
|---|---|
| http://www.proftpd.org/ | Product Release Notes |
| https://github.com/proftpd/proftpd/issues/2170 | Issue Tracking Mitigation |
| https://www.vulncheck.com/advisories/proftpd-acl-bypass-via-proc-self-root-path-prefix-in-rnfr | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-35025 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-35025
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-35025 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-35025 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/proftpd/proftpd', 'vendor': 'ProFTPD Project', 'product': 'ProFTPD', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.3.9b'}, {'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.3.10rc2'}], 'defaultStatus': 'affected'}] [{'repo': 'https://github.com/proftpd/proftpd', 'vendor': 'ProFTPD Project', 'product': 'ProFTPD', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.3.9b'}, {'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.3.10rc2'}], 'packageURL': 'pkg:github/proftpd/proftpd', 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Jul. 02, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:* versions up to (including) 1.3.9b *cpe:2.3:a:proftpd:proftpd:1.3.10:rc1:*:*:*:*:*:* *cpe:2.3:a:proftpd:proftpd:1.3.10:rc2:*:*:*:*:*:* Added Reference Type VulnCheck: http://www.proftpd.org/ Types: Product, Release Notes Added Reference Type VulnCheck: https://github.com/proftpd/proftpd/issues/2170 Types: Issue Tracking, Mitigation Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/proftpd-acl-bypass-via-proc-self-root-path-prefix-in-rnfr Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 24, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-35025', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-24T15:00:28.448881Z'} -
New CVE Received by [email protected]
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/proftpd/proftpd', 'vendor': 'ProFTPD Project', 'product': 'ProFTPD', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.3.9b'}, {'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '1.3.10rc2'}], 'defaultStatus': 'affected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-59 Added Reference http://www.proftpd.org/ Added Reference https://github.com/proftpd/proftpd/issues/2170 Added Reference https://www.vulncheck.com/advisories/proftpd-acl-bypass-via-proc-self-root-path-prefix-in-rnfr