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CVE-2026-19671— Improper handling of highly compressed data (data amplification) in CISA Malcolm

Quick assessment

Affected
CISAgov Malcolm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cybersecurity and Infrastructure Security Agency Malcolm是Cybersecurity and Infrastructure Security Agency政府部门的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.07.1及之前版本存在资源管理错误漏洞，该漏洞源于上传处理管道（scripts/safe-extract.py）对容器归档文件实施条目数、嵌

CVSS 6.5 · Medium EPSS 0.31% · P23

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
CISAgov Malcolm ≤ 26.07.1 affected
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I. Basic Information for CVE-2026-19671

Vulnerability Information
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Vulnerability Title
Improper handling of highly compressed data (data amplification) in CISA Malcolm
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Cybersecurity and Infrastructure Security Agency Malcolm 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cybersecurity and Infrastructure Security Agency Malcolm是Cybersecurity and Infrastructure Security Agency政府部门的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.07.1及之前版本存在资源管理错误漏洞，该漏洞源于上传处理管道（scripts/safe-extract.py）对容器归档文件实施条目数、嵌
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
CISAgov Malcolm 0 ~ 26.07.1 -

II. Public POCs for CVE-2026-19671

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III. Intelligence Information for CVE-2026-19671

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Vendor Advisories for CVE-2026-19671 (2)

IV. Related Vulnerabilities

Same product: Malcolm
Same vendor: CISAgov
Same weakness: CWE-409

V. Comments for CVE-2026-19671

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