Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-55676
cisagov Malcolm — Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L N L N H H H 8.7 .0051 41.2 —
AFFECTED
Product Versions Fixed
Malcolm < 26.06.1 – 26.06.1
TIMELINE
Jun 17 Reserved by GitHub_M
Aug 11 Published (CNA: GitHub_M)
Oct 2 PATCH SHIPPED — CVE-2026-55676 (cisagov Malcolm). Fixed in Malcolm 26.06.1.
Oct 2 RESCORED — CVE-2026-55676 (cisagov Malcolm). CVSS 8.8 → 8.7 (NVD).
Description
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-list that should restrict accepted file types is an empty array by default (`file-upload/php/config.php:16`), so the type check is a no-op and every extension is accepted. The filename sanitizer keeps the `.php` extension intact. Committed files land in `/var/www/upload/server/php/files` (`file-upload/php/config.php:7`), and the component's nginx routes any URL ending in `.php` to php-fpm. An authenticated `GET /server/php/files/<name>.php` then executes the uploaded code as `www-data`. Prior to version 26.06.1, in RBAC mode, the upload endpoint is reachable by the granular `ROLE_UPLOAD` role (`nginx/lua/nginx_auth_helpers.lua:71`), a role intended only for submitting capture files. As a result, a user holding the upload-only role runs arbitrary PHP as `www-data` inside the file-upload container. Version 26.06.1 fixes the issue.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| June 17, 2026 | Reserved | Reserved by GitHub_M |
| August 11, 2026 | Published | Published (CNA: GitHub_M) |
| October 2, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-55676 (cisagov Malcolm). Fixed in Malcolm 26.06.1. |
| October 2, 2026 | RESCORED | RESCORED — CVE-2026-55676 (cisagov Malcolm). CVSS 8.8 → 8.7 (NVD). |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| cisagov | Malcolm | — | < 26.06.1 | 26.06.1 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55676 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
