{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "misp-modules",
          "repo": "https://github.com/MISP/misp-modules/",
          "vendor": "misp",
          "versions": [
            {
              "lessThanOrEqual": "v3.0.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Alexandre Dulaunoy"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "George Chen"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eA Server-Side Request Forgery (SSRF) protection bypass existed in the \u003ccode\u003ehtml_to_markdown\u003c/code\u003e expansion module of \u003cstrong\u003emisp-modules\u003c/strong\u003e.\u003c/p\u003e\u003cp\u003eThe module attempts to prevent requests to loopback, private, link-local, and other restricted IP address ranges. However, IP addresses were compared against the blocked ranges without first normalising IPv4-mapped IPv6 addresses.\u003c/p\u003e\u003cp\u003eAn authenticated attacker able to invoke the module could supply an IPv4-mapped IPv6 address, such as:\u003c/p\u003e\u003cpre\u003e\u003ccode\u003ehttp://[::ffff:127.0.0.1]/\nhttp://[::ffff:169.254.169.254]/\u003c/code\u003e\u003c/pre\u003e\u003cp\u003eAlternatively, the attacker could use a hostname that resolves to an IPv4-mapped IPv6 address. These addresses were treated as IPv6 addresses and therefore did not match the corresponding blocked IPv4 ranges.\u003c/p\u003e\u003cp\u003eSuccessful exploitation could cause the misp-modules server to connect to services available through its loopback interface, internal network, or link-local network. This could expose internal web services, administrative interfaces, or cloud instance metadata, with retrieved content potentially returned to the attacker as converted Markdown.\u003c/p\u003e\u003cp\u003eThe vulnerability has been addressed by normalising IPv4-mapped IPv6 addresses to their underlying IPv4 representation before applying the blocked-range checks. URLs without a valid hostname are now also rejected.\u003c/p\u003e\u003ch2\u003e\u003c/h2\u003e\u003cbr\u003e"
            }
          ],
          "value": "A Server-Side Request Forgery (SSRF) protection bypass existed in the html_to_markdown expansion module of misp-modules.\n\nThe module attempts to prevent requests to loopback, private, link-local, and other restricted IP address ranges. However, IP addresses were compared against the blocked ranges without first normalising IPv4-mapped IPv6 addresses.\n\nAn authenticated attacker able to invoke the module could supply an IPv4-mapped IPv6 address, such as:\n\nhttp://[::ffff:127.0.0.1]/\nhttp://[::ffff:169.254.169.254]/\n\nAlternatively, the attacker could use a hostname that resolves to an IPv4-mapped IPv6 address. These addresses were treated as IPv6 addresses and therefore did not match the corresponding blocked IPv4 ranges.\n\nSuccessful exploitation could cause the misp-modules server to connect to services available through its loopback interface, internal network, or link-local network. This could expose internal web services, administrative interfaces, or cloud instance metadata, with retrieved content potentially returned to the attacker as converted Markdown.\n\nThe vulnerability has been addressed by normalising IPv4-mapped IPv6 addresses to their underlying IPv4 representation before applying the blocked-range checks. URLs without a valid hostname are now also rejected."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-101",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-101 Server Side Include (SSI) Injection"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "providerUrgency": "GREEN",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/AU:Y/RE:M/U:Green",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "MODERATE"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "other": {
            "content": {
              "Automatable": "Yes",
              "Exploitation": "None",
              "Technical Impact": "Partial",
              "Value Density": "Diffused",
              "version": "2.0"
            },
            "type": "SSVCv2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918 Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "orgId": "00000000-0000-4000-9000-000000000000"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/MISP/misp-modules/commit/3bae4108a3ba1e507727d5264697fd7303ba0b89"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Server-Side Request Forgery protection bypass in misp-modules html_to_markdown via IPv4-mapped IPv6 addresses",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "00000000-0000-4000-9000-000000000000",
    "cveId": "CVE-2026-62143",
    "datePublished": "2026-07-13T07:51:40.478167Z",
    "dateReserved": "2026-07-13T07:52:02.284Z",
    "dateUpdated": "2026-07-13T07:52:02.354140Z",
    "requesterUserId": "00000000-0000-4000-9000-000000000000",
    "serial": 1,
    "state": "PUBLISHED",
    "vulnId": "gcve-1-2026-20007"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}