CVE-2026-55629: Whistle is an HTTP, HTTP2, HTTPS, and WebSocket debugging proxy

This month

HIGH 8.7REMOTE

CVE-2026-55629 is a high-severity flaw (CVSS 8.7) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

High severity
CISA SSVC: public proof of concept
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-07-16
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc.

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-07-16 20:16 UTCPublished CVE record published
2026-10-24 20:10 UTCUpdated Record last modified

Exact fixes by distribution

npm · whistle · FIXED · 2.10.3 · vulnerable: < 2.10.3 · source

npm install whistle@">=2.10.3" npm ls whistle

Fedora ELN · mingw-pcre2 · FIXED · 10.49-1.eln159 · FEDORA-2026-f41c1162af · source

sudo dnf upgrade --advisory=FEDORA-2026-f41c1162af

Fedora 46 · mingw-cfitsio · FIXED · 4.7.0-2.fc46 · FEDORA-2026-425e65a7c8 · source

sudo dnf upgrade --advisory=FEDORA-2026-425e65a7c8

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-55629?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-55629 being exploited?

CVE-2026-55629 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-55629 affect?

CVE-2026-55629 affects affected software. Severity is high (CVSS 8.7). 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 patt

How urgent is CVE-2026-55629?

Priority 51/100. High severity; CISA SSVC: public proof of concept; Remotely exploitable, no login, no user action

References

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