Quick answers
- Is CVE-2026-115339 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-115339 being exploited in the wild.
- How severe is CVE-2026-115339?
- High severity, with a CVSS score of 7.5, published 9 November 2026.
- Which products and versions are affected?
- Progress Software WS FTP Server prior to 2025.0.5 on Windows.
- Is there a fix for CVE-2026-115339?
- Yes: fixed in 2025.0.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-115339 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-115339?
- Check whether you run Progress Software WS FTP Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 2025.0.5
Technical details
A denial of service vulnerability in WS_FTP Server stems from insufficient resource limits that fail to properly constrain memory or connection usage. An unauthenticated remote attacker can send crafted network requests to exhaust resources and crash the service. The flaw is resolved in version 2025.0.5 and later.
Affected products
- Progress Software WS_FTP Server prior to 2025.0.5 on Windows
Timeline
- 2026-11-09: disclosed