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CVE-2026-63090— ProFTPD mod_sftp Heap Buffer Overflow via SFTP Packet Reassembly

Quick assessment

Affected
proftpd proftpd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ProFTPD是ProFTPD团队开源的一套可配置性强的开放源代码的FTP服务器软件。 ProFTPD 1.3.9c之前版本和1.3.10rc3版本存在缓冲区错误漏洞，该漏洞源于mod_sftp模块中fxp.c组件的堆缓冲区溢出，允许经过身份验证的低权限攻击者通过发送特制的超过16 KB重组缓冲区的SFTP数据包片段，触发错误的条件重新分配，破坏池空闲列表元数据，覆盖root_fs BSS全局指针以引用伪造的文件系统结构，并通过特制的RENAME请求将pr_fsio_stat()重定向到system()，

CVSS 8.8 · High EPSS 0.93% · P59

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
proftpd proftpd < 1.3.9c affected
1.3.10rc1< 1.3.10rc3 affected
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I. Basic Information for CVE-2026-63090

Vulnerability Information
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Vulnerability Title
ProFTPD mod_sftp Heap Buffer Overflow via SFTP Packet Reassembly
Source: CVE Program / CVE List V5
Vulnerability Description
ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module that allows authenticated low-privilege attackers to achieve arbitrary code execution by sending crafted SFTP packet fragments exceeding the 16 KB reassembly buffer in the fxp.c component. Attackers can supply oversized fragments to trigger an incorrectly conditioned reallocation, corrupt pool freelist metadata, overwrite the root_fs BSS global pointer to reference a fake filesystem struct, and redirect pr_fsio_stat() to system() via a crafted RENAME request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
ProFTPD 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ProFTPD是ProFTPD团队开源的一套可配置性强的开放源代码的FTP服务器软件。 ProFTPD 1.3.9c之前版本和1.3.10rc3版本存在缓冲区错误漏洞，该漏洞源于mod_sftp模块中fxp.c组件的堆缓冲区溢出，允许经过身份验证的低权限攻击者通过发送特制的超过16 KB重组缓冲区的SFTP数据包片段，触发错误的条件重新分配，破坏池空闲列表元数据，覆盖root_fs BSS全局指针以引用伪造的文件系统结构，并通过特制的RENAME请求将pr_fsio_stat()重定向到system()，
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
proftpd proftpd 0 ~ 1.3.9c -

II. Public POCs for CVE-2026-63090

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 13804 chars
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III. Intelligence Information for CVE-2026-63090

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Patches & Fixes for CVE-2026-63090 (3)

Vendor Advisories for CVE-2026-63090 (1)

Vendor Pages for CVE-2026-63090 (2)

IV. Related Vulnerabilities

Same product: proftpd
Same vendor: proftpd
Same weakness: CWE-122

V. Comments for CVE-2026-63090

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