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  <updated>2026-09-30T08:28:47.046131+00:00</updated>
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    <id>https://vulnerability.circl.lu/vuln/cve-2026-19671</id>
    <title>CVE-2026-19671 — Improper handling of highly compressed data (data amplification) in CISA Malcolm</title>
    <updated>2026-09-30T08:28:47.057866+00:00</updated>
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      <div xmlns="http://www.w3.org/1999/xhtml"><p><strong>Affected:</strong> CISAgov Malcolm</p>
<p>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.</p></div>
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    <link href="https://vulnerability.circl.lu/vuln/cve-2026-19671"/>
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