CVE-2026-107335GHSA-f2v6-8cj4-mhr6GHSA-jr6p-63pg-hr6g

Improper Handling of Highly Compressed Data in Malcolm

CISA Malcolm

CVSS

6.5Medium

ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 8 Oct 2026. Not in the KEV catalogCISA via CVE List

Exploit odds (EPSS)0.46%Chance of exploitation activity in the next 30 days, higher than 38% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed inNone listedNo source names a fixed version. Check the vendor advisory below

Published8 Oct 2026Updated 14 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

CISA MalcolmCISA ICS advisories, 15 Oct 2026

Description

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.

Text from CVE List

Affected versions 2

Malcolmaffected: all versions through 26.07.1CVE List
Malcolmunaffected: 26.08.0CVE List