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CISA Malcolm EUVDEUVD-2026-95122

| CVE-2026-107335 MEDIUM
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-10-08 icscert GHSA-ffq8-c9hx-7wvf
6.5
CVSS 3.1 · Vendor: icscert
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Severity by source

Vendor (icscert) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Network-reachable upload (AV:N) by any authenticated upload-permitted user (PR:L), no interaction, pure availability impact (A:H) from disk exhaustion with no C/I effect.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (icscert).

CVSS VectorVendor: icscert

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Metadata Corrected
Oct 08, 2026 - 18:40 vuln.today
tag: Information Disclosure removed
Analysis Generated
Oct 08, 2026 - 18:19 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Malcolm's upload-processing pipeline allows an authenticated user with PCAP/log upload rights to exhaust the shared Docker volume by submitting a small single-stream compressed file (e.g., .gz, .bz2, .xz, .lzma, .lz) that decompresses to an effectively unbounded size. The flaw, CWE-409 decompression bomb, bypasses the entry-count, nesting-depth, and uncompressed-byte limits that scripts/safe-extract.py applies only to container archives (zip/tar/rar/7z via libarchive), causing disk exhaustion that disrupts OpenSearch, Logstash, Arkime, and Zeek for all users. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated account that has been granted permission to upload PCAP/log files into Malcolm's upload-processing pipeline. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but moderate-severity availability issue, correctly scored at CVSS 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) with CWE-409 (data amplification / decompression bomb). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor's fix once available; consult the GitHub security advisory GHSA-jr6p-63pg-hr6g (https://github.com/cisagov/Malcolm/security/advisories/GHSA-jr6p-63pg-hr6g) and CISA ICS advisory ICSA-26-280-01 for patched version guidance. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-95122 vulnerability details – vuln.today

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