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CVE-2026-63090

HIGH
8.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-63090
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-07-15 15:45 UTC
Published
2026-07-20 14:22 UTC
Last updated
2026-07-20 14:22 UTC
Primary CWE
CWE-122
Heap-based Buffer Overflow
Vendor / Product
proftpd / proftpd
Sources
cve.org  ·  NVD

Severity & Metrics

8.8 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products (1)
VendorProductPlatformVersions
proftpd proftpd — 0 < 1.3.9c, 1.3.10rc1 < 1.3.10rc3
Weakness (CWE)
CWESourceDescription
CWE-122 cna Heap-based Buffer Overflow
CVSS scores (2)
ScoreSeverityVersionSourceVector
8.8 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References (6)
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