CVE-2026-90869

Pre-Authentication SSH Denial of Service via Malformed Public-Key Signature in Progress WS_FTP Server

State: Published
Severity: 7.5 High
Published: Oct 29, 2026
Updated: Oct 29, 2026
Reserved: Sep 14, 2026

Description

A remote attacker who knows a valid account's enrolled SSH public key can terminate the shared SSH service in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	ProgressSoftware

Weaknesses

CWE-125 Out-of-bounds Read
CWE-20 Improper Input Validation

Affected Products

Product	Versions
WS_FTP ServerProgress Software	before 2024.0.7Affected before 2025.0.4Affected

References

https://progress.lightning.force.com/lightning/r/Knowledge__kav/ka7Pb000001vl86IAA/viewvendor-advisory

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