CVE-2026-107335

Improper Handling of Highly Compressed Data in Malcolm

State
Published
Severity
6.5 Medium
Published
Oct 8, 2026
Updated
Oct 14, 2026
Reserved
Oct 7, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.16.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hicscert

Weaknesses

  • CWE-409 Improper handling of highly compressed data (data amplification)

Affected Products

ProductVersions
MalcolmCISA
  • 26.07.1 and earlierAffected
  • 26.08.0Not affected

References

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