CVE-2026-19671

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Source
https://cve.org/CVERecord?id=CVE-2026-19671
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-19671.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-19671
Aliases
Published
2026-08-18T19:11:58.230Z
Modified
2026-08-20T03:30:36.188668458Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Improper handling of highly compressed data (data amplification) in CISA Malcolm
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-409"
    ],
    "cna_assigner": "icscert",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19671.json"
}
References

Affected packages

Git / github.com/cisagov/malcolm

Affected ranges

Type
GIT
Repo
https://github.com/cisagov/malcolm
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
2c19ef04d85230634ac70cc68b8f418a0666afec
Database specific
Show details 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "26.07.1"
        }
    ]
}

Affected versions

v1.*
v1.2.0
v1.2.1
v1.2.2
v1.3.0
v1.3.1
v1.4.0
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.7.0
v1.7.1
v1.7.1a
v1.7.2
v1.8.0
v1.8.1
v2.*
v2.0.0
v2.0.0-pre1
v2.0.1
v2.0.2
v2.0.3
v2.0.4
v2.0.5
v2.0.6
v2.1.0
v2.1.1
v2.2.0
v2.2.1
v2.3.0
v2.4.0
v2.4.0.1
v2.4.1
v2.4.2
v2.5.0
v2.6.0
v2.6.1
v26.*
v26.05.2
v26.06.0
v26.06.1
v26.07.0
v26.07.1
v3.*
v3.0.0
v3.0.1
v5.*
v5.2.1
v5.2.2
v5.2.3
v5.2.4
v6.*
v6.4.0
v6.4.1
v6.4.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-19671.json"