log4j: Fix of CVE-2026-34479

{
  "id": "f034934e997c9a60c569f4f6c5b945959dac9bdac54a8552717d19c4dabd90e2",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1780054786",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "log4j: Fix of CVE-2026-34479",
    "summary": "- CVE-2026-34479: fix Log4j1XmlLayout invalid XML 1.0 character escape",
    "evidence": "osv:CLSA-2026-1780054786",
    "products": [
      {
        "name": {
          "value": "log4j",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.17.2-1.el9_2.tuxcare.els1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "log4j-jcl",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.17.2-1.el9_2.tuxcare.els1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "log4j-slf4j",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.17.2-1.el9_2.tuxcare.els1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "log4j-web",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.17.2-1.el9_2.tuxcare.els1",
            "evidence": "/affected/3/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1780054786",
      "aliases": [
        "CLSA-2026-1780054786"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.17.2-1.el9_2.tuxcare.els1"
                }
              ]
            }
          ],
          "package": {
            "name": "log4j",
            "purl": "pkg:rpm/tuxcare/log4j?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1780054786.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.17.2-1.el9_2.tuxcare.els1"
                }
              ]
            }
          ],
          "package": {
            "name": "log4j-jcl",
            "purl": "pkg:rpm/tuxcare/log4j-jcl?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1780054786.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.17.2-1.el9_2.tuxcare.els1"
                }
              ]
            }
          ],
          "package": {
            "name": "log4j-slf4j",
            "purl": "pkg:rpm/tuxcare/log4j-slf4j?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1780054786.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.17.2-1.el9_2.tuxcare.els1"
                }
              ]
            }
          ],
          "package": {
            "name": "log4j-web",
            "purl": "pkg:rpm/tuxcare/log4j-web?distro=almalinux-9.2",
            "ecosystem": "TuxCare:AlmaLinux:9.2"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1780054786.json"
          }
        }
      ],
      "modified": "2026-10-26T09:30:04.922404435Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-34479"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1780054786.html"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-34479",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 446835,
  "published_at": "2026-05-29T14:40:54+00:00"
}