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

Vulnerability from cvelistv5 – Published: 2026-02-05 17:48 – Updated: 2026-02-05 17:48
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 ?
No CVSS data available.
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
Go
References
Impacted products
Vendor Product Version
golang.org/x/net golang.org/x/net/html Affected: 0 , < 0.45.0 (semver)
Create a notification for this product.
Credits
Guido Vranken Jakub Ciolek
Show details on NVD website
To clipboard 

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          "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"
        }
      ],
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        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en"
            }
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        }
      ],
      "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": "2026-02-05T17:48:44.562Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-47911\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-02-05T18:16:09.893\",\"lastModified\":\"2026-02-05T20:47:37.777\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://github.com/golang/vulndb/issues/4440\",\"source\":\"security@golang.org\"},{\"url\":\"https://go.dev/cl/709876\",\"source\":\"security@golang.org\"},{\"url\":\"https://groups.google.com/g/golang-announce/c/jnQcOYpiR2c\",\"source\":\"security@golang.org\"},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-4440\",\"source\":\"security@golang.org\"}]}}"
  }
}


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  • 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.
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  • 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.



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