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TI-2026-40156 Aliases CVE-2026-55629GHSA-3vfr-4gwf-qxfp

Whistle: Path traversal

Priority HIGH 77CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00554 46th percentileScored 2026-11-07
Fix Fixed whistle (avwo): 2.10.3whistle (npm): 2.10.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
avwowhistlebefore 2.10.32.10.3Patch availableCNA
—whistle (npm)before 2.10.32.10.3Patch availableGHSA-3vfr-4gwf-qxfp
  • whistle Vendoravwo Affected before 2.10.3 Fixed in 2.10.3 Patch available CNA
  • whistle (npm) Vendor— Affected before 2.10.3 Fixed in 2.10.3 Patch available GHSA-3vfr-4gwf-qxfp

Remediation

  • Fix · CNA whistle (avwo) Fixed in 2.10.3
  • Fix · GHSA-3vfr-4gwf-qxfp whistle (npm) Fixed in 2.10.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55629
  2. 2026-10-03 Alias added: GHSA-3vfr-4gwf-qxfp
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 1

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences