Vulnerability · Published Oct 29, 2026 · Assigned by ProgressSoftware
CVE-2026-90869Pre-Authentication SSH Denial of Service via Malformed Public-Key Signature in Progress WS_FTP Server
High 7.5
In plain English
A high-severity out-of-bounds read in WS_FTP Server from Progress Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 70.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Progress Software | WS_FTP Server | 0 – before 2024.0.70 – before 2025.0.4 |
Weakness: CWE-125, CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H