{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "tornado"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.5.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49854"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-126"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-12T18:30:19Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Summary\n\nTornado\u0027s optional native extension `tornado.speedups` implements `websocket_mask` without validating that the `mask` argument is exactly four bytes long. The C function reads four bytes from `mask` unconditionally, even when Python passes a shorter byte string. This can read beyond the provided buffer, exposing up to 3 bytes of uninitialized memory.\n\nThe behavior is reachable from Tornado\u0027s XSRF token decoder when `xsrf_cookies=True` and the native extension is active. \n\n### Mitigations\n\nThis bug is fixed in Tornado 6.5.6. Prior to upgrading to this version, setting the environment variable TORNADO_EXTENSION=0 will disable the vulnerable code (at the expense of reducing websocket performance).",
  "id": "GHSA-cx3h-4qpv-8hc9",
  "modified": "2026-06-12T18:30:19Z",
  "published": "2026-06-12T18:30:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-cx3h-4qpv-8hc9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tornadoweb/tornado"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tornadoweb/tornado/releases/tag/v6.5.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Tornado has out-of-bounds memory access via C extension"
}

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.suse.com/support/security/rating/",
      "text": "moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "python311-tornado6-6.5.7-1.1 on GA media",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "These are all security issues fixed in the python311-tornado6-6.5.7-1.1 package on the GA media of openSUSE Tumbleweed.",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "openSUSE-Tumbleweed-2026-11027",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://www.suse.com/support/security/contact/",
      "name": "SUSE Product Security Team",
      "namespace": "https://www.suse.com/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11027-1.json"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-49853 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-49853/"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-49854 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-49854/"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-49855 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-49855/"
      }
    ],
    "title": "python311-tornado6-6.5.7-1.1 on GA media",
    "tracking": {
      "current_release_date": "2026-06-13T00:00:00Z",
      "generator": {
        "date": "2026-06-13T00:00:00Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "openSUSE-SU-2026:11027-1",
      "initial_release_date": "2026-06-13T00:00:00Z",
      "revision_history": [
        {
          "date": "2026-06-13T00:00:00Z",
          "number": "1",
          "summary": "Current version"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python311-tornado6-6.5.7-1.1.aarch64",
                "product": {
                  "name": "python311-tornado6-6.5.7-1.1.aarch64",
                  "product_id": "python311-tornado6-6.5.7-1.1.aarch64"
                }
              },
              {
                "category": "product_version",
                "name": "python313-tornado6-6.5.7-1.1.aarch64",
                "product": {
                  "name": "python313-tornado6-6.5.7-1.1.aarch64",
                  "product_id": "python313-tornado6-6.5.7-1.1.aarch64"
                }
              },
              {
                "category": "product_version",
                "name": "python314-tornado6-6.5.7-1.1.aarch64",
                "product": {
                  "name": "python314-tornado6-6.5.7-1.1.aarch64",
                  "product_id": "python314-tornado6-6.5.7-1.1.aarch64"
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python311-tornado6-6.5.7-1.1.ppc64le",
                "product": {
                  "name": "python311-tornado6-6.5.7-1.1.ppc64le",
                  "product_id": "python311-tornado6-6.5.7-1.1.ppc64le"
                }
              },
              {
                "category": "product_version",
                "name": "python313-tornado6-6.5.7-1.1.ppc64le",
                "product": {
                  "name": "python313-tornado6-6.5.7-1.1.ppc64le",
                  "product_id": "python313-tornado6-6.5.7-1.1.ppc64le"
                }
              },
              {
                "category": "product_version",
                "name": "python314-tornado6-6.5.7-1.1.ppc64le",
                "product": {
                  "name": "python314-tornado6-6.5.7-1.1.ppc64le",
                  "product_id": "python314-tornado6-6.5.7-1.1.ppc64le"
                }
              }
            ],
            "category": "architecture",
            "name": "ppc64le"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python311-tornado6-6.5.7-1.1.s390x",
                "product": {
                  "name": "python311-tornado6-6.5.7-1.1.s390x",
                  "product_id": "python311-tornado6-6.5.7-1.1.s390x"
                }
              },
              {
                "category": "product_version",
                "name": "python313-tornado6-6.5.7-1.1.s390x",
                "product": {
                  "name": "python313-tornado6-6.5.7-1.1.s390x",
                  "product_id": "python313-tornado6-6.5.7-1.1.s390x"
                }
              },
              {
                "category": "product_version",
                "name": "python314-tornado6-6.5.7-1.1.s390x",
                "product": {
                  "name": "python314-tornado6-6.5.7-1.1.s390x",
                  "product_id": "python314-tornado6-6.5.7-1.1.s390x"
                }
              }
            ],
            "category": "architecture",
            "name": "s390x"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "python311-tornado6-6.5.7-1.1.x86_64",
                "product": {
                  "name": "python311-tornado6-6.5.7-1.1.x86_64",
                  "product_id": "python311-tornado6-6.5.7-1.1.x86_64"
                }
              },
              {
                "category": "product_version",
                "name": "python313-tornado6-6.5.7-1.1.x86_64",
                "product": {
                  "name": "python313-tornado6-6.5.7-1.1.x86_64",
                  "product_id": "python313-tornado6-6.5.7-1.1.x86_64"
                }
              },
              {
                "category": "product_version",
                "name": "python314-tornado6-6.5.7-1.1.x86_64",
                "product": {
                  "name": "python314-tornado6-6.5.7-1.1.x86_64",
                  "product_id": "python314-tornado6-6.5.7-1.1.x86_64"
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "openSUSE Tumbleweed",
                "product": {
                  "name": "openSUSE Tumbleweed",
                  "product_id": "openSUSE Tumbleweed",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:opensuse:tumbleweed"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python311-tornado6-6.5.7-1.1.aarch64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64"
        },
        "product_reference": "python311-tornado6-6.5.7-1.1.aarch64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python311-tornado6-6.5.7-1.1.ppc64le as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le"
        },
        "product_reference": "python311-tornado6-6.5.7-1.1.ppc64le",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python311-tornado6-6.5.7-1.1.s390x as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x"
        },
        "product_reference": "python311-tornado6-6.5.7-1.1.s390x",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python311-tornado6-6.5.7-1.1.x86_64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64"
        },
        "product_reference": "python311-tornado6-6.5.7-1.1.x86_64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python313-tornado6-6.5.7-1.1.aarch64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64"
        },
        "product_reference": "python313-tornado6-6.5.7-1.1.aarch64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python313-tornado6-6.5.7-1.1.ppc64le as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le"
        },
        "product_reference": "python313-tornado6-6.5.7-1.1.ppc64le",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python313-tornado6-6.5.7-1.1.s390x as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x"
        },
        "product_reference": "python313-tornado6-6.5.7-1.1.s390x",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python313-tornado6-6.5.7-1.1.x86_64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64"
        },
        "product_reference": "python313-tornado6-6.5.7-1.1.x86_64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python314-tornado6-6.5.7-1.1.aarch64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64"
        },
        "product_reference": "python314-tornado6-6.5.7-1.1.aarch64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python314-tornado6-6.5.7-1.1.ppc64le as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le"
        },
        "product_reference": "python314-tornado6-6.5.7-1.1.ppc64le",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python314-tornado6-6.5.7-1.1.s390x as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x"
        },
        "product_reference": "python314-tornado6-6.5.7-1.1.s390x",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "python314-tornado6-6.5.7-1.1.x86_64 as component of openSUSE Tumbleweed",
          "product_id": "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64"
        },
        "product_reference": "python314-tornado6-6.5.7-1.1.x86_64",
        "relates_to_product_reference": "openSUSE Tumbleweed"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-49853",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-49853"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "unknown",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-49853",
          "url": "https://www.suse.com/security/cve/CVE-2026-49853"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-13T00:00:00Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-49853"
    },
    {
      "cve": "CVE-2026-49854",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-49854"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "unknown",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-49854",
          "url": "https://www.suse.com/security/cve/CVE-2026-49854"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-13T00:00:00Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-49854"
    },
    {
      "cve": "CVE-2026-49855",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-49855"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "unknown",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x",
          "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-49855",
          "url": "https://www.suse.com/security/cve/CVE-2026-49855"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python311-tornado6-6.5.7-1.1.x86_64",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python313-tornado6-6.5.7-1.1.x86_64",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.aarch64",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.ppc64le",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.s390x",
            "openSUSE Tumbleweed:python314-tornado6-6.5.7-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-13T00:00:00Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-49855"
    }
  ]
}