CVE-2026-63177

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Source
https://cve.org/CVERecord?id=CVE-2026-63177
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63177.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63177
Aliases
  • GHSA-m5fr-rv3h-xg2r
Published
2026-08-11T20:30:57.901Z
Modified
2026-08-14T03:52:02.973135654Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N CVSS Calculator
Summary
Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63177.json",
    "cna_assigner": "GitHub_M"
}
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
Fixed
551ce2d94052f986a14662aabb85eecfe96d0a30
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "26.07.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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
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-2026-63177.json"