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CVE-2026-63177— Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC

Quick assessment

Affected
cisagov Malcolm
Exploitation
Public or AI PoC available; prioritize validation
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组织的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.07.0之前版本存在授权问题漏洞，该漏洞源于Nginx OpenResty Lua层中的角色访问控制评估原始未标准化的request_uri，而

CVSS 7.1 · High EPSS 0.30% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
cisagov Malcolm < 26.07.0 affected
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I. Basic Information for CVE-2026-63177

Vulnerability Information
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Vulnerability Title
Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC
Source: CVE Program / CVE List V5
Vulnerability Description
Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0, role-based access control enforced in the Nginx OpenResty Lua layer evaluates the raw, unnormalized `ngx.var.request_uri`, while Nginx itself routes requests using the normalized path. An authenticated low-privilege user can prepend a traversal segment (for example `/x/../upload/...`) so that Nginx routes the request to a restricted backend while the Lua role check fails to match any rule and falls open, granting access it should deny. Version 26.07.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Cybersecurity and Infrastructure Security Agency Malcolm 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cybersecurity and Infrastructure Security Agency Malcolm是Cybersecurity and Infrastructure Security Agency组织的一款网络流量与日志分析平台。 Cybersecurity and Infrastructure Security Agency Malcolm 26.07.0之前版本存在授权问题漏洞，该漏洞源于Nginx OpenResty Lua层中的角色访问控制评估原始未标准化的request_uri，而
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 < 26.07.0 -

II. Public POCs for CVE-2026-63177

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12482 chars
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III. Intelligence Information for CVE-2026-63177

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Vendor Advisories for CVE-2026-63177 (3)

Vendor Pages for CVE-2026-63177 (1)

Same Patch Batch · cisagov · 2026-08-11 · 4 CVEs total

CVE-2026-55676 8.8 HIGH Malcolm vulnerable to RCE via unrestricted .php upload to the file-upload component
CVE-2026-63133 6.5 MEDIUM Malcolm has Uncontrolled Resource Consumption in Archive Extraction (Inode-Exhaustion DoS)
CVE-2026-63134 5.4 MEDIUM Malcolm's Path Traversal in Archive Extraction Allows Arbitrary Directory Creation

IV. Related Vulnerabilities

Same product: Malcolm
Same vendor: cisagov
Same weakness: CWE-863

V. Comments for CVE-2026-63177

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