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CVE-2026-28407— malcontent's nested archive extraction failure can drop content from scan inputs

Quick assessment

Affected
chainguard-dev malcontent
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.

malcontent是Chainguard开源的一个供应链攻击检测工具。 malcontent 1.21.0之前版本存在安全漏洞，该漏洞源于会删除提取失败的嵌套归档，可能遗留恶意内容。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-28407

Vulnerability Information
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Vulnerability Title
malcontent's nested archive extraction failure can drop content from scan inputs
Source: CVE Program / CVE List V5
Vulnerability Description
malcontent is software for discovering supply-chain compromises through context, differential analysis, and YARA. Prior to version 1.21.0, malcontent would remove nested archives which failed to extract which could potentially leave malicious content. A better approach is to preserve these archives so that malcontent can attempt a best-effort scan of the archive bytes. Version 1.21.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件检查或处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
malcontent 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
malcontent是Chainguard开源的一个供应链攻击检测工具。 malcontent 1.21.0之前版本存在安全漏洞，该漏洞源于会删除提取失败的嵌套归档，可能遗留恶意内容。
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
chainguard-dev malcontent < 1.21.0 -

II. Public POCs for CVE-2026-28407

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III. Intelligence Information for CVE-2026-28407

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IV. Related Vulnerabilities

Same product: malcontent
Same vendor: chainguard-dev
Same weakness: CWE-703

V. Comments for CVE-2026-28407

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