Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M

CVE-2026-55629Whistle: Path traversal

High 8.7

In plain English

A high-severity path traversal in whistle from avwo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.6%top 53.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	whistle	2.10.3	GHSA-3vfr-4gwf-qxfp

Affected products (as reported)

Vendor	Product	Versions
avwo	whistle	< 2.10.3

Weakness: CWE-22 · 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

References

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