What is CVE-2026-55676?

CVE-2026-55676 is a high-severity vulnerability in Cisagov Malcolm, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-08-11.

How severe is CVE-2026-55676?

High severity. CVSS v3 base score is 8.8 out of 10.

Arbitrary file upload in Cisagov Malcolm

CVE-2026-55676

Malcolm is a network traffic analysis tool suite. The file-upload component (FilePond PHP backend) accepts uploads at `POST /server/php/submit.php` and stores them in a directory served by the same nginx and php-fpm instance. The allow-lis…

Vulnerability class: Unrestricted File Upload

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cisagov Malcolm — versions < 26.06.1

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-55676?: CVE-2026-55676 is a high-severity vulnerability in Cisagov Malcolm, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-08-11.
How severe is CVE-2026-55676?: High severity. CVSS v3 base score is 8.8 out of 10.