{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Malcolm",
          "vendor": "cisagov",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 26.07.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-11T20:30:57.901Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r"
        },
        {
          "name": "https://github.com/cisagov/Malcolm/releases/tag/v26.07.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cisagov/Malcolm/releases/tag/v26.07.0"
        }
      ],
      "source": {
        "advisory": "GHSA-m5fr-rv3h-xg2r",
        "discovery": "UNKNOWN"
      },
      "title": "Malcolm Vulnerable to Authorization Bypass via URI Normalization Differential in Nginx Lua RBAC"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63177",
    "datePublished": "2026-08-11T20:30:57.901Z",
    "dateReserved": "2026-07-15T22:13:00.720Z",
    "dateUpdated": "2026-08-11T20:30:57.901Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63177\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-11T21:17:44.443\",\"lastModified\":\"2026-08-11T21:17:44.443\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"cisagov\",\"product\":\"Malcolm\",\"versions\":[{\"version\":\"\u003c 26.07.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":4.2}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-863\"}]}],\"references\":[{\"url\":\"https://github.com/cisagov/Malcolm/releases/tag/v26.07.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/cisagov/Malcolm/security/advisories/GHSA-m5fr-rv3h-xg2r\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}