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TI-2026-27231 Aliases CVE-2026-35025GHSA-9vr4-2f43-pc8v

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

Priority MEDIUM 40CWE-59Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00505 43rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ProFTPD ProjectProFTPDup to 1.3.9b; up to 1.3.10rc2—No fix listedCNA
  • ProFTPD VendorProFTPD Project Affected up to 1.3.9b; up to 1.3.10rc2 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:*up to 1.3.9bVulnerableProFTPD
cpe:2.3:a:proftpd:proftpd:1.3.10:rc1:*:*:*:*:*:*1.3.10 rc1VulnerableProFTPD
cpe:2.3:a:proftpd:proftpd:1.3.10:rc2:*:*:*:*:*:*1.3.10 rc2VulnerableProFTPD
  • cpe:2.3:a:proftpd:proftpd:*:*:*:*:*:*:*:* Versions up to 1.3.9b Vulnerable ·ProFTPD
  • cpe:2.3:a:proftpd:proftpd:1.3.10:rc1:*:*:*:*:*:* Versions 1.3.10 rc1 Vulnerable ·ProFTPD
  • cpe:2.3:a:proftpd:proftpd:1.3.10:rc2:*:*:*:*:*:* Versions 1.3.10 rc2 Vulnerable ·ProFTPD

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35025
  2. 2026-10-03 Alias added: GHSA-9vr4-2f43-pc8v

References

Other 2

  • TI-2006-05599 Stack-based buffer overflow in the sreplace function in ProFTPD 1.3.0 and earlier allows… CVSS 2.0HIGH 10.0
  • TI-2010-05061 ProFTPD 1.3.3c Backdoor Command Execution CVSS 4.0CRITICAL 9.3
  • TI-2003-00766 ProFTPD 1.2.7 through 1.2.9rc2 does not properly translate newline characters when… CVSS 2.0HIGH 9.0
  • TI-2009-00521 SQL injection vulnerability in ProFTPD Server 1.3.1 through 1.3.2rc2 allows remote… CVSS 2.0HIGH 7.5
  • TI-1999-00861 Buffer overflow in ProFTPD, wu-ftpd, and beroftpd allows remote attackers to gain root… CVSS 2.0HIGH 10.0
  • TI-1999-00363 Buffer overflows in wuarchive ftpd (wu-ftpd) and ProFTPD lead to remote root access… CVSS 2.0HIGH 10.0
See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences