Red Hat Security Advisory: expat security update

{
  "id": "a4f62788eab1b789f0738977073061f08ebf3f51a2ab6b52d6cddde7e2228531",
  "url": "https://osv.dev/vulnerability/RHSA-2026%3A72448",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Red Hat Security Advisory: expat security update",
    "summary": "Red Hat Security Advisory: expat security update",
    "evidence": "osv:RHSA-2026:72448",
    "products": [
      {
        "name": {
          "value": "expat",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:2.5.0-4.el8_10",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "expat-debuginfo",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:2.5.0-4.el8_10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "expat-debugsource",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:2.5.0-4.el8_10",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "expat-devel",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0:2.5.0-4.el8_10",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "RHSA-2026:72448",
      "aliases": [
        "RHSA-2026:72448"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:2.5.0-4.el8_10"
                }
              ]
            }
          ],
          "package": {
            "name": "expat",
            "purl": "pkg:rpm/redhat/expat",
            "ecosystem": "Red Hat:enterprise_linux:8::baseos"
          },
          "database_specific": {
            "source": "https://security.access.redhat.com/data/osv/RHSA-2026:72448.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:2.5.0-4.el8_10"
                }
              ]
            }
          ],
          "package": {
            "name": "expat-debuginfo",
            "purl": "pkg:rpm/redhat/expat-debuginfo",
            "ecosystem": "Red Hat:enterprise_linux:8::baseos"
          },
          "database_specific": {
            "source": "https://security.access.redhat.com/data/osv/RHSA-2026:72448.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:2.5.0-4.el8_10"
                }
              ]
            }
          ],
          "package": {
            "name": "expat-debugsource",
            "purl": "pkg:rpm/redhat/expat-debugsource",
            "ecosystem": "Red Hat:enterprise_linux:8::baseos"
          },
          "database_specific": {
            "source": "https://security.access.redhat.com/data/osv/RHSA-2026:72448.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0:2.5.0-4.el8_10"
                }
              ]
            }
          ],
          "package": {
            "name": "expat-devel",
            "purl": "pkg:rpm/redhat/expat-devel",
            "ecosystem": "Red Hat:enterprise_linux:8::baseos"
          },
          "database_specific": {
            "source": "https://security.access.redhat.com/data/osv/RHSA-2026:72448.json"
          }
        }
      ],
      "modified": "2026-10-15T10:26:05Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-66046",
        "CVE-2026-93990"
      ],
      "references": [
        "https://access.redhat.com/errata/RHSA-2026:72448",
        "https://access.redhat.com/security/updates/classification/#important",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2517901",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2538967",
        "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_72448.json",
        "https://access.redhat.com/security/cve/CVE-2026-66046",
        "https://www.cve.org/CVERecord?id=CVE-2026-66046",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-66046",
        "https://github.com/libexpat/libexpat/pull/1321",
        "https://www.vulncheck.com/advisories/expat-denial-of-service-via-storeatts-quadratic-complexity",
        "https://access.redhat.com/security/cve/CVE-2026-93990",
        "https://www.cve.org/CVERecord?id=CVE-2026-93990",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93990",
        "https://github.com/libexpat/libexpat",
        "https://github.com/libexpat/libexpat/commit/ff6e1d7e750bbe245178f51a47a965dc8342861a",
        "https://github.com/libexpat/libexpat/pull/1282",
        "https://www.vulncheck.com/advisories/expat-through-2.8.4-malformed-utf-16-acceptance-via-unchecked-surrogate"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-66046",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-93990",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 331208,
  "published_at": "2026-09-29T10:18:21+00:00"
}