Fix CVE(s): CVE-2026-56407, CVE-2026-56408, CVE-2026-56409

{
  "id": "4616720407a41cdfc3ae7b30a4c401c92326c071d5dffdb4dd9d7ff2840df6c1",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1786451206",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fix CVE(s): CVE-2026-56407, CVE-2026-56408, CVE-2026-56409",
    "summary": "* SECURITY UPDATE: Integer overflow in doProlog related to storeEntityValue and entity textLen (libexpat before 2.8.2) - debian/patches/CVE-2026-56407.patch: cap the entity value pool length at INT_MAX before assigning it to the signed ENTITY::textLen in doProlog - CVE-2026-56407 * SECURITY UPDATE: Integer overflow in copyString (libexpat before 2.8.2) - debian/patches/CVE-2026-56408.patch: reject lengths above SIZE_MAX / sizeof(XML_Char) before sizing the copy, closing the multiplication overflow in wide-character (libexpatw) builds - CVE-2026-56408 * SECURITY UPDATE: Integer overflow for the output filename in xmlwf when -d outputDir is used (libexpat before 2.8.2) - debian/patches/CVE-2026-56409.patch: check the output path join for addition and multiplication overflow, and check the malloc result, before writing the joined path - CVE-2026-56409",
    "evidence": "osv:CLSA-2026-1786451206",
    "products": [
      {
        "name": {
          "value": "expat",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.2.6-2+deb10u7+tuxcare.els7",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libexpat1",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.2.6-2+deb10u7+tuxcare.els7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libexpat1-dev",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.2.6-2+deb10u7+tuxcare.els7",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1786451206",
      "aliases": [
        "CLSA-2026-1786451206"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.6-2+deb10u7+tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "expat",
            "purl": "pkg:deb/tuxcare/expat?distro=debian-10",
            "ecosystem": "TuxCare:Debian:10"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786451206.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.6-2+deb10u7+tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "libexpat1",
            "purl": "pkg:deb/tuxcare/libexpat1?distro=debian-10",
            "ecosystem": "TuxCare:Debian:10"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786451206.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.6-2+deb10u7+tuxcare.els7"
                }
              ]
            }
          ],
          "package": {
            "name": "libexpat1-dev",
            "purl": "pkg:deb/tuxcare/libexpat1-dev?distro=debian-10",
            "ecosystem": "TuxCare:Debian:10"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786451206.json"
          }
        }
      ],
      "modified": "2026-10-26T09:31:52.831342916Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-56407",
        "CVE-2026-56408",
        "CVE-2026-56409"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/debian10els/CLSA-2026-1786451206.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56407",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56408",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56409"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-56407",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-56408",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-56409",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 448806,
  "published_at": "2026-08-11T12:26:59+00:00"
}