expat: Fix of CVE-2026-56131

{
  "id": "1f855a6f37f3fda43b3e201ce647fa13abefc9613baaa458b5ce2d71b62fdb69",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1788951028",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "expat: Fix of CVE-2026-56131",
    "summary": "- CVE-2026-56131: fix a use-after-free by refusing re-entrant XML_ResumeParser calls issued from inside handler callbacks; carries the prerequisite handler call-depth tracking, which also covers CVE-2026-50219 and CVE-2026-56412",
    "evidence": "osv:CLSA-2026-1788951028",
    "products": [
      {
        "name": {
          "value": "expat",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.1.0-15.0.7.el7_9.tuxcare.els6",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "expat-devel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.1.0-15.0.7.el7_9.tuxcare.els6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "expat-static",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.1.0-15.0.7.el7_9.tuxcare.els6",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1788951028",
      "aliases": [
        "CLSA-2026-1788951028"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.1.0-15.0.7.el7_9.tuxcare.els6"
                }
              ]
            }
          ],
          "package": {
            "name": "expat",
            "purl": "pkg:rpm/tuxcare/expat?distro=rhel-7",
            "ecosystem": "TuxCare:RHEL:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788951028.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.1.0-15.0.7.el7_9.tuxcare.els6"
                }
              ]
            }
          ],
          "package": {
            "name": "expat-devel",
            "purl": "pkg:rpm/tuxcare/expat-devel?distro=rhel-7",
            "ecosystem": "TuxCare:RHEL:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788951028.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.1.0-15.0.7.el7_9.tuxcare.els6"
                }
              ]
            }
          ],
          "package": {
            "name": "expat-static",
            "purl": "pkg:rpm/tuxcare/expat-static?distro=rhel-7",
            "ecosystem": "TuxCare:RHEL:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1788951028.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:27.835119198Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-50219",
        "CVE-2026-56131",
        "CVE-2026-56412"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/rhel7els/CLSA-2026-1788951028.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56131"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-50219",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-56131",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-56412",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449925,
  "published_at": "2026-09-09T10:50:39+00:00"
}