libxml2: Fix of 4 CVEs

{
  "id": "6f3a8ddb2cb391cdb350b39c604db1bb65ba19fb5787c3727b008ed79450a63a",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1789655873",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libxml2: Fix of 4 CVEs",
    "summary": "- CVE-2026-86140: add the missing bounds checks around the two unguarded strcat() calls in xmlSnprintfElements(), the sibling of the function fixed for CVE-2025-24928 - CVE-2026-86142: reject a saturated xmlStrlen() result in xmlXPtrEvalXPtrPart() before it is used to size the XPointer buffer - CVE-2026-86143: check the xmlBufUse() length against INT_MAX before narrowing it to the int parameter of the output writecallback, at all six call sites - CVE-2026-86144: propagate the document parseFlags through xmlXIncludeProcess(), xmlXIncludeProcessTree() and xmlXIncludeLoadTxt() so XML_PARSE_NONET is honoured during XInclude resolution",
    "evidence": "osv:CLSA-2026-1789655873",
    "products": [
      {
        "name": {
          "value": "libxml2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.9.13-12.el9_6.tuxcare.els9",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libxml2-devel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.9.13-12.el9_6.tuxcare.els9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libxml2-static",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.9.13-12.el9_6.tuxcare.els9",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "python3-libxml2",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.9.13-12.el9_6.tuxcare.els9",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1789655873",
      "aliases": [
        "CLSA-2026-1789655873"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.9.13-12.el9_6.tuxcare.els9"
                }
              ]
            }
          ],
          "package": {
            "name": "libxml2",
            "purl": "pkg:rpm/tuxcare/libxml2?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1789655873.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.9.13-12.el9_6.tuxcare.els9"
                }
              ]
            }
          ],
          "package": {
            "name": "libxml2-devel",
            "purl": "pkg:rpm/tuxcare/libxml2-devel?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1789655873.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.9.13-12.el9_6.tuxcare.els9"
                }
              ]
            }
          ],
          "package": {
            "name": "libxml2-static",
            "purl": "pkg:rpm/tuxcare/libxml2-static?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1789655873.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.9.13-12.el9_6.tuxcare.els9"
                }
              ]
            }
          ],
          "package": {
            "name": "python3-libxml2",
            "purl": "pkg:rpm/tuxcare/python3-libxml2?distro=almalinux-9.6",
            "ecosystem": "TuxCare:AlmaLinux:9.6"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1789655873.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:19.066571469Z",
      "provider": "osv",
      "upstream": [
        "CVE-2025-24928",
        "CVE-2026-86140",
        "CVE-2026-86142",
        "CVE-2026-86143",
        "CVE-2026-86144"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1789655873.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-86140",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-86142",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-86143",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-86144"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2025-24928",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-86140",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-86142",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-86143",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2026-86144",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 449829,
  "published_at": "2026-09-17T14:38:07+00:00"
}