Medium 6.5Published Oct 8, 2026

CVE-2026-107335Improper Handling of Highly Compressed Data in Malcolm

Updated under an hour ago (2026-10-19 08:30 UTC)

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It affects CISA Malcolm. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for CISA Malcolm

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-409
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: icscert
NVD analysis: Awaiting Analysis
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

CISA Malcolm cisa:malcolm (from the name)	through 26.07.1; 26.08.0 not affected	CNA record

References

https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.jsongovernment-resource
https://github.com/cisagov/Malcolm/security/advisories/GHSA-jr6p-63pg-hr6g

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.