expat: Fix of CVE-2026-93990

{
  "id": "c845b2c4c181377888bc012d216414ca56f6af6388e96137828f8d7d3803d881",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1790172968",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "expat: Fix of CVE-2026-93990",
    "summary": "- CVE-2026-93990: reject a UTF-16 high surrogate that is not followed by a low surrogate, by adding LITTLE2_/BIG2_IS_INVALID_CHAR and the matching little2_/big2_isInvalid4 vtable entries to the UTF-16 tokenizers in lib/xmltok.c, so a lone high surrogate can no longer consume the following code unit as a fake low surrogate and hide markup from the parser",
    "evidence": "osv:CLSA-2026-1790172968",
    "products": [
      {
        "name": {
          "value": "expat",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.5.0-1.el8.tuxcare.els9",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "expat-devel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.5.0-1.el8.tuxcare.els9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "expat-static",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.5.0-1.el8.tuxcare.els9",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1790172968",
      "aliases": [
        "CLSA-2026-1790172968"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.5.0-1.el8.tuxcare.els9"
                }
              ]
            }
          ],
          "package": {
            "name": "expat",
            "purl": "pkg:rpm/tuxcare/expat?distro=centos-8.4",
            "ecosystem": "TuxCare:CentOS:8.4"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1790172968.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.5.0-1.el8.tuxcare.els9"
                }
              ]
            }
          ],
          "package": {
            "name": "expat-devel",
            "purl": "pkg:rpm/tuxcare/expat-devel?distro=centos-8.4",
            "ecosystem": "TuxCare:CentOS:8.4"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1790172968.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.5.0-1.el8.tuxcare.els9"
                }
              ]
            }
          ],
          "package": {
            "name": "expat-static",
            "purl": "pkg:rpm/tuxcare/expat-static?distro=centos-8.4",
            "ecosystem": "TuxCare:CentOS:8.4"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1790172968.json"
          }
        }
      ],
      "modified": "2026-10-26T09:31:43.856465534Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-93990"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/centos8.4els/CLSA-2026-1790172968.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93990"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-93990",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 448278,
  "published_at": "2026-09-23T14:16:18+00:00"
}