CVE-2025-47911 (GCVE-0-2025-47911)

Vulnerability from cvelistv5 – Published: 2026-02-05 17:48 – Updated: 2026-02-12 15:23
VLAI
Title
Quadratic parsing complexity in golang.org/x/net/html
Summary
The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-12 15:23 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version CPE status
golang.org/x/net golang.org/x/net/html Affected: 0 , < 0.45.0 (semver)
guessed Create a notification for this product.
Credits
Guido Vranken Jakub Ciolek
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-47911",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-12T15:23:40.307728Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-12T15:23:55.509Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/html",
          "product": "golang.org/x/net/html",
          "programRoutines": [
            {
              "name": "parser.parse"
            },
            {
              "name": "Parse"
            },
            {
              "name": "ParseFragment"
            },
            {
              "name": "ParseFragmentWithOptions"
            },
            {
              "name": "ParseWithOptions"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.45.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Guido Vranken"
        },
        {
          "lang": "en",
          "value": "Jakub Ciolek"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-05T17:48:44.562Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/709876"
        },
        {
          "url": "https://github.com/golang/vulndb/issues/4440"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/jnQcOYpiR2c"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-4440"
        }
      ],
      "title": "Quadratic parsing complexity in golang.org/x/net/html"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2025-47911",
    "datePublished": "2026-02-05T17:48:44.562Z",
    "dateReserved": "2025-05-13T23:31:29.597Z",
    "dateUpdated": "2026-02-12T15:23:55.509Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-47911",
      "date": "2026-08-18",
      "epss": "0.00502",
      "percentile": "0.40647"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-47911\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-02-05T18:16:09.893\",\"lastModified\":\"2026-06-17T09:28:50.070\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.\"},{\"lang\":\"es\",\"value\":\"La funci\u00f3n html.Parse en golang.org/x/net/html tiene una complejidad de an\u00e1lisis cuadr\u00e1tica al procesar ciertas entradas, lo que puede llevar a una denegaci\u00f3n de servicio (DoS) si un atacante proporciona contenido HTML especialmente dise\u00f1ado.\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"vendor\":\"golang.org/x/net\",\"product\":\"golang.org/x/net/html\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"golang.org/x/net/html\",\"programRoutines\":[{\"name\":\"parser.parse\"},{\"name\":\"Parse\"},{\"name\":\"ParseFragment\"},{\"name\":\"ParseFragmentWithOptions\"},{\"name\":\"ParseWithOptions\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"0.45.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-02-12T15:23:40.307728Z\",\"id\":\"CVE-2025-47911\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:go:html:*:*:*:*:*:go:*:*\",\"versionEndExcluding\":\"0.45.0\",\"matchCriteriaId\":\"376264FC-D0BB-4AAD-B6DE-127D83F3070A\"}]}]}],\"references\":[{\"url\":\"https://github.com/golang/vulndb/issues/4440\",\"source\":\"security@golang.org\",\"tags\":[\"Issue Tracking\"]},{\"url\":\"https://go.dev/cl/709876\",\"source\":\"security@golang.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://groups.google.com/g/golang-announce/c/jnQcOYpiR2c\",\"source\":\"security@golang.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-4440\",\"source\":\"security@golang.org\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-22T16:32:51+00:00",
      "cve": "CVE-2025-47911",
      "id": "CVE-2025-47911",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:fixed": "144",
      "product_status:known_affected": "577",
      "product_status:known_not_affected": "161",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "golang.org/x/net/html: Quadratic parsing complexity in golang.org/x/net/html",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-47911.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-47911\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-02-12T15:23:40.307728Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-02-12T15:23:50.510Z\"}}], \"cna\": {\"title\": \"Quadratic parsing complexity in golang.org/x/net/html\", \"credits\": [{\"lang\": \"en\", \"value\": \"Guido Vranken\"}, {\"lang\": \"en\", \"value\": \"Jakub Ciolek\"}], \"affected\": [{\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/html\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.45.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/html\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"parser.parse\"}, {\"name\": \"Parse\"}, {\"name\": \"ParseFragment\"}, {\"name\": \"ParseFragmentWithOptions\"}, {\"name\": \"ParseWithOptions\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/709876\"}, {\"url\": \"https://github.com/golang/vulndb/issues/4440\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/jnQcOYpiR2c\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-4440\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-400: Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-02-05T17:48:44.562Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-47911\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-12T15:23:55.509Z\", \"dateReserved\": \"2025-05-13T23:31:29.597Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-02-05T17:48:44.562Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.