ProFTPD Project up to 1.3.9d/1.3.10rc4 mod_rewrite buffer overflow

Summaryinfo

A vulnerability was found in ProFTPD Project ProFTPD up to 1.3.9d/1.3.10rc4 and classified as very critical. The affected element is an unknown function of the component mod_rewrite. The manipulation results in buffer overflow. This vulnerability is identified as CVE-2026-119146. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, was found in ProFTPD Project ProFTPD up to 1.3.9d/1.3.10rc4. Affected is an unknown code of the component mod_rewrite. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

ProFTPD before 1.3.9e and 1.3.10rc5 contains a buffer overflow vulnerability in the mod_rewrite int:utf8trans RewriteMap that allows remote attackers to overwrite static buffers. Attackers can send FTP command arguments longer than 1024 bytes, without authentication if pre-login commands are rewritten, to corrupt session memory and crash the session.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-119146 since 10/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/30/2026).

Upgrading to version 1.3.9e or 1.3.10rc5 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ProFTPD Project

Name

• ProFTPD

Version

• 1.3.9a
• 1.3.9b
• 1.3.9c
• 1.3.9d
• 1.3.10rc1
• 1.3.10rc2
• 1.3.10rc3
• 1.3.10rc4

License

• open-source

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