USN-8813-1 (UBUNTU-CVE-2026-56131)

Vulnerability from osv_ubuntu – Published: 2026-09-24 12:45 – Updated: 2026-09-24 12:45 – Source website
VLAI
Summary
expat vulnerabilities
Details

It was discovered that Expat did not correctly handle certain integer arithmetic. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-56406, CVE-2026-56407, CVE-2026-56409, CVE-2026-56410, CVE-2026-56411)

It was discovered that Expat did not correctly track handler call depth. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-56131)

It was discovered that Expat did not correctly handle certain memory operations. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-56132)

It was discovered that Expat did not correctly handle certain Unicode characters. An attacker could possibly use this issue to cause Expat to use excessive resources, leading to a denial of service. (CVE-2026-72522)

It was discovered that Expat did not correctly process certain XML attributes. A remote attacker could possibly use this issue to cause Expat to use excessive resources, leading to a denial of service. (CVE-2026-66046)

It was discovered that Expat did not correctly handle certain external entities. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-76641)

It was discovered that Expat did not correctly track handler call depth with custom encodings. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-76957)

References
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{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-56131",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56132",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56406",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56407",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56409",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56410",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-66046",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-72522",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-76641",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-76957",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "expat",
            "binary_version": "2.1.0-4ubuntu1.4+esm13"
          },
          {
            "binary_name": "lib64expat1",
            "binary_version": "2.1.0-4ubuntu1.4+esm13"
          },
          {
            "binary_name": "libexpat1",
            "binary_version": "2.1.0-4ubuntu1.4+esm13"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "expat",
        "purl": "pkg:deb/ubuntu/expat@2.1.0-4ubuntu1.4+esm13?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.0-4ubuntu1.4+esm13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0-4",
        "2.1.0-4ubuntu1",
        "2.1.0-4ubuntu1.1",
        "2.1.0-4ubuntu1.2",
        "2.1.0-4ubuntu1.3",
        "2.1.0-4ubuntu1.4",
        "2.1.0-4ubuntu1.4+esm1",
        "2.1.0-4ubuntu1.4+esm2",
        "2.1.0-4ubuntu1.4+esm4",
        "2.1.0-4ubuntu1.4+esm6",
        "2.1.0-4ubuntu1.4+esm7",
        "2.1.0-4ubuntu1.4+esm8",
        "2.1.0-4ubuntu1.4+esm9",
        "2.1.0-4ubuntu1.4+esm10",
        "2.1.0-4ubuntu1.4+esm11",
        "2.1.0-4ubuntu1.4+esm12"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-56131",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56132",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56406",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56407",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56409",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56410",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-66046",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-72522",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-76641",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-76957",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "expat",
            "binary_version": "2.1.0-7ubuntu0.16.04.5+esm14"
          },
          {
            "binary_name": "lib64expat1",
            "binary_version": "2.1.0-7ubuntu0.16.04.5+esm14"
          },
          {
            "binary_name": "libexpat1",
            "binary_version": "2.1.0-7ubuntu0.16.04.5+esm14"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "expat",
        "purl": "pkg:deb/ubuntu/expat@2.1.0-7ubuntu0.16.04.5+esm14?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.0-7ubuntu0.16.04.5+esm14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0-7",
        "2.1.0-7ubuntu0.16.04.1",
        "2.1.0-7ubuntu0.16.04.2",
        "2.1.0-7ubuntu0.16.04.3",
        "2.1.0-7ubuntu0.16.04.4",
        "2.1.0-7ubuntu0.16.04.5",
        "2.1.0-7ubuntu0.16.04.5+esm2",
        "2.1.0-7ubuntu0.16.04.5+esm5",
        "2.1.0-7ubuntu0.16.04.5+esm6",
        "2.1.0-7ubuntu0.16.04.5+esm7",
        "2.1.0-7ubuntu0.16.04.5+esm8",
        "2.1.0-7ubuntu0.16.04.5+esm9",
        "2.1.0-7ubuntu0.16.04.5+esm10",
        "2.1.0-7ubuntu0.16.04.5+esm11",
        "2.1.0-7ubuntu0.16.04.5+esm12",
        "2.1.0-7ubuntu0.16.04.5+esm13"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-56131",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56132",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56406",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56407",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56409",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56410",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56411",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-66046",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-72522",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-76641",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-76957",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "expat",
            "binary_version": "2.2.5-3ubuntu0.9+esm5"
          },
          {
            "binary_name": "libexpat1",
            "binary_version": "2.2.5-3ubuntu0.9+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "expat",
        "purl": "pkg:deb/ubuntu/expat@2.2.5-3ubuntu0.9+esm5?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.5-3ubuntu0.9+esm5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.3-1",
        "2.2.3-2",
        "2.2.5-0ubuntu2",
        "2.2.5-3",
        "2.2.5-3ubuntu0.1",
        "2.2.5-3ubuntu0.2",
        "2.2.5-3ubuntu0.4",
        "2.2.5-3ubuntu0.7",
        "2.2.5-3ubuntu0.8",
        "2.2.5-3ubuntu0.9",
        "2.2.5-3ubuntu0.9+esm1",
        "2.2.5-3ubuntu0.9+esm2",
        "2.2.5-3ubuntu0.9+esm3",
        "2.2.5-3ubuntu0.9+esm4"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-56131",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56132",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56406",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56407",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-56409",
              "severity": [
                {
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            },
            {
              "fixed": "2.7.4-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.7.1-2",
        "2.7.3-1",
        "2.7.4-1",
        "2.7.4-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Expat did not correctly handle certain integer\narithmetic. An attacker could possibly use this issue to cause a denial of\nservice. \n(CVE-2026-56406, CVE-2026-56407, CVE-2026-56409, CVE-2026-56410, CVE-2026-56411)\n\nIt was discovered that Expat did not correctly track handler call depth. An\nattacker could possibly use this issue to cause Expat to crash or execute\narbitrary code. (CVE-2026-56131)\n\nIt was discovered that Expat did not correctly handle certain memory\noperations. An attacker could possibly use this issue to cause Expat to\ncrash or execute arbitrary code. (CVE-2026-56132)\n\nIt was discovered that Expat did not correctly handle certain Unicode\ncharacters. An attacker could possibly use this issue to cause Expat to use\nexcessive resources, leading to a denial of service. (CVE-2026-72522)\n\nIt was discovered that Expat did not correctly process certain XML\nattributes. A remote attacker could possibly use this issue to cause Expat\nto use excessive resources, leading to a denial of service.\n(CVE-2026-66046)\n\nIt was discovered that Expat did not correctly handle certain external\nentities. An attacker could possibly use this issue to cause Expat to crash\nor execute arbitrary code. (CVE-2026-76641)\n\nIt was discovered that Expat did not correctly track handler call depth\nwith custom encodings. An attacker could possibly use this issue to cause\nExpat to crash or execute arbitrary code. (CVE-2026-76957)",
  "id": "USN-8813-1",
  "modified": "2026-09-24T12:45:19Z",
  "published": "2026-09-24T12:45:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8813-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56131"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56132"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56406"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56407"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56409"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56410"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-56411"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-66046"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-72522"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-76641"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-76957"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "expat vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-56131",
    "UBUNTU-CVE-2026-56132",
    "UBUNTU-CVE-2026-56406",
    "UBUNTU-CVE-2026-56407",
    "UBUNTU-CVE-2026-56409",
    "UBUNTU-CVE-2026-56410",
    "UBUNTU-CVE-2026-56411",
    "UBUNTU-CVE-2026-66046",
    "UBUNTU-CVE-2026-72522",
    "UBUNTU-CVE-2026-76641",
    "UBUNTU-CVE-2026-76957"
  ]
}



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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

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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.



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.