Fix CVE(s): CVE-2026-66046, CVE-2026-93990

{
  "id": "7eacb08d0f088f4e54c2f7142441287507c0fa4e9ef7e01a39703e5a042aa337",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1791254668",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Fix CVE(s): CVE-2026-66046, CVE-2026-93990",
    "summary": "* SECURITY UPDATE: XML injection via malformed UTF-16 input: a high surrogate not followed by a low surrogate is accepted and consumes the following code unit, hiding markup characters from the parser (libexpat through 2.8.4) - debian/patches/CVE-2026-93990.patch: reject a UTF-16 high surrogate whose second code unit is not a low surrogate by defining IS_INVALID_CHAR (and isInvalid4 for XML_MIN_SIZE) for the little2_/big2_ encodings; also carries upstream's regression test into tests/runtests.c - CVE-2026-93990 * SECURITY UPDATE: Denial of service via quadratic complexity in storeAtts(), which scanned elementType->defaultAtts linearly to determine the CDATA status of every non-normalized attribute (libexpat through 2.8.3) - debian/patches/CVE-2026-66046.patch: store the index of the first default attribute declaration in the per-element hash table and use a hash lookup instead of the linear scan; includes upstream's follow-up for dtdCopy() so that external entity parsers do not read past the hash table entries - CVE-2026-66046",
    "evidence": "osv:CLSA-2026-1791254668",
    "products": [
      {
        "name": {
          "value": "expat",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.2.6-2+deb10u7+tuxcare.els10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libexpat1",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.2.6-2+deb10u7+tuxcare.els10",
            "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.els10",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1791254668",
      "aliases": [
        "CLSA-2026-1791254668"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.6-2+deb10u7+tuxcare.els10"
                }
              ]
            }
          ],
          "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-2026-1791254668.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.6-2+deb10u7+tuxcare.els10"
                }
              ]
            }
          ],
          "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-2026-1791254668.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.6-2+deb10u7+tuxcare.els10"
                }
              ]
            }
          ],
          "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-2026-1791254668.json"
          }
        }
      ],
      "modified": "2026-10-26T09:31:53.718710314Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-66046",
        "CVE-2026-93990"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/debian10els/CLSA-2026-1791254668.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-66046",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93990"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-66046",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-93990",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 448871,
  "published_at": "2026-10-06T02:44:39+00:00"
}