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.
Metrics
Affected Vendors & Products
References
History
Tue, 18 Aug 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Cisagov
Cisagov malcolm |
|
| Vendors & Products |
Cisagov
Cisagov malcolm |
Tue, 18 Aug 2026 20:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Tue, 18 Aug 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Improper handling of highly compressed data (data amplification) in CISA Malcolm | |
| Weaknesses | CWE-409 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: icscert
Published: 2026-08-18T19:11:58.230Z
Updated: 2026-08-18T19:45:58.424Z
Reserved: 2026-08-12T21:15:03.423Z
Link: CVE-2026-19671
Updated: 2026-08-18T19:42:45.336Z
Status : Awaiting Analysis
Published: 2026-08-18T20:17:13.660
Modified: 2026-09-08T15:28:33.090
Link: CVE-2026-19671
No data.