PT-2026-61611 · Proftpd · Proftpd

CVE-2026-63090 · Published 2026-07-20 · Updated 2026-07-20

NVD

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-63090

Affected Products

Proftpd

References · 7

• https://github.com/proftpd/proftpd/commit/4ee8701bcf425f11b3b2116e634ff3e655d918b1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-63090 · Security Note
• https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc3-3 · Note
• https://github.com/proftpd/proftpd/releases/tag/v1.3.9c · Note
• https://github.com/proftpd/proftpd/issues/2190 · Note
• https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES · Note
• https://vulncheck.com/advisories/proftpd-mod-sftp-heap-buffer-overflow-via-sftp-packet-reassembly · Note