---
id: CVE-2026-19671
title: >-
  Malcolm's upload-processing pipeline (scripts/safe-extract.py) enforces
  entry-count, nesting-depth, and total-uncompressed-byte limits when extracting
  container archives (zip/tar/rar/7z via libarchive), but those limits are not
  applied w…
summary: >-
  Malcolm's upload-processing pipeline (scripts/safe-extract.py) enforces
  entry-count, nesting-depth, and total-uncompressed-byte limits when extracting
  container archives (zip/tar/rar/7z via libarchive), but those limits are not
  applied w…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-409
published: '2026-08-18'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T15:28:33.090'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19671'
references:
  - url: 'https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6'
    label: ics-cert@hq.dhs.gov
  - url: 'https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01'
    label: ics-cert@hq.dhs.gov
  - url: 'https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00387
epssPercentile: 0.30075
ingestedAt: '2026-09-08T15:33:26.954Z'
---

## Overview

Malcolm's upload-processing pipeline (scripts/safe-extract.py) enforces entry-count, nesting-depth, and total-uncompressed-byte limits when extracting container archives (zip/tar/rar/7z via libarchive), but those limits are not applied when the uploaded file is a single-stream compressed format (.gz, .bz2, .xz, .lzma, .lz) that isn't a .tar.*-style archive. Any authenticated user permitted to upload PCAP/log files can upload a small, highly compressible file (e.g. a gzip bomb) that decompresses to an effectively unbounded size on disk, exhausting the shared Docker volume used by OpenSearch, Logstash, Arkime, and Zeek, and disrupting the platform for all users.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.