GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-25680 (GCVE-0-2026-25680)

Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 17:00
VLAI
Title
Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html
Summary
Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-22 17:00 UTC
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
Assigner
Impacted products
Vendor Product Version CPE status
golang.org/x/net golang.org/x/net/html Affected: 0 , < 0.55.0 (semver)
guessed Create a notification for this product.
Credits
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-25680",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T17:00:30.926552Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-22T17:00:35.395Z",
          "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": "0.55.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "IPC Labs"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:01:21.805Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/781702"
        },
        {
          "url": "https://go.dev/issue/79573"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5028"
        }
      ],
      "title": "Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-25680",
    "datePublished": "2026-05-22T15:01:21.805Z",
    "dateReserved": "2026-02-05T01:35:43.737Z",
    "dateUpdated": "2026-05-22T17:00:35.395Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-25680",
      "date": "2026-09-18",
      "epss": "0.00326",
      "percentile": "0.25959"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-06T14:41:36.000Z",
      "cve": "CVE-2026-25680",
      "id": "msrc_CVE-2026-25680",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "35",
      "product_status:known_affected": "44",
      "product_status:known_not_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-25680.json",
      "version": "14"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "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": "0.55.0",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "security@golang.org"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:golang:net:*:*:*:*:*:go:*:*",
                    "matchCriteriaId": "38C86E7B-A1CA-4670-B113-FC9585261F6F",
                    "versionEndExcluding": "0.55.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service."
          },
          {
            "lang": "es",
            "value": "Procesar HTML arbitrario puede consumir tiempo excesivo de CPU, lo que podr\u00eda llevar a una denegaci\u00f3n de servicio."
          }
        ],
        "id": "CVE-2026-25680",
        "lastModified": "2026-07-23T16:10:00.137",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 3.6,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-25680",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T17:00:30.926552Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-05-22T16:16:19.753",
        "references": [
          {
            "source": "security@golang.org",
            "tags": [
              "Issue Tracking"
            ],
            "url": "https://go.dev/cl/781702"
          },
          {
            "source": "security@golang.org",
            "tags": [
              "Issue Tracking"
            ],
            "url": "https://go.dev/issue/79573"
          },
          {
            "source": "security@golang.org",
            "tags": [
              "Mailing List"
            ],
            "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
          },
          {
            "source": "security@golang.org",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://pkg.go.dev/vuln/GO-2026-5028"
          }
        ],
        "sourceIdentifier": "security@golang.org",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-400"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-08T18:48:43+00:00",
      "cve": "CVE-2026-25680",
      "id": "CVE-2026-25680",
      "initial_release_date": "2026-05-22T15:01:21.805000+00:00",
      "product_status:fixed": "152",
      "product_status:known_affected": "493",
      "product_status:known_not_affected": "360",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "golang.org/x/net/html: golang.org/x/net/html: Denial of Service due to excessive HTML parsing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25680.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T02:11:38Z",
      "cve": "CVE-2026-25680",
      "id": "CVE-2026-25680",
      "initial_release_date": "2026-06-02T01:42:57Z",
      "product_status:first_fixed": "3",
      "product_status:known_affected": "284",
      "product_status:known_not_affected": "526",
      "product_status:recommended": "312",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-25680",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-25680.json",
      "version": "43"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "NETWORK",
                  "availabilityImpact": "HIGH",
                  "baseScore": 6.5,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "REQUIRED",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-25680",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-05-22T17:00:30.926552Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-05-22T17:00:26.491Z",
              "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": "0.55.0",
                  "status": "affected",
                  "version": "0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "value": "IPC Labs"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "CWE-407: Inefficient Algorithmic Complexity",
                  "lang": "en"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-22T15:01:21.805Z",
            "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
            "shortName": "Go"
          },
          "references": [
            {
              "url": "https://go.dev/cl/781702"
            },
            {
              "url": "https://go.dev/issue/79573"
            },
            {
              "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
            },
            {
              "url": "https://pkg.go.dev/vuln/GO-2026-5028"
            }
          ],
          "title": "Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "assignerShortName": "Go",
        "cveId": "CVE-2026-25680",
        "datePublished": "2026-05-22T15:01:21.805Z",
        "dateReserved": "2026-02-05T01:35:43.737Z",
        "dateUpdated": "2026-05-22T17:00:35.395Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


Loading…