tar: Fix of CVE-2026-18477

{
  "id": "ad6ceb5abd78da3bac41bd7a27ae536bc3d201149ec5e2bc86908a9064b642f7",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1787337920",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tar: Fix of CVE-2026-18477",
    "summary": "- CVE-2026-18477: apply safer_name_suffix to incremental dumpdir 'X' entries so the temporary directory template can no longer escape the extraction directory - use mkdtempat instead of mkdtemp so the 'X' temporary directory is created relative to -C (backport of upstream d479b2cc)",
    "evidence": "osv:CLSA-2026-1787337920",
    "products": [
      {
        "name": {
          "value": "tar",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2:1.34-7.el9.tuxcare.els4",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1787337920",
      "aliases": [
        "CLSA-2026-1787337920"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2:1.34-7.el9.tuxcare.els4"
                }
              ]
            }
          ],
          "package": {
            "name": "tar",
            "purl": "pkg:rpm/tuxcare/tar?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-2026-1787337920.json"
          }
        }
      ],
      "modified": "2026-10-26T09:30:36.647014626Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-18477"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1787337920.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-18477"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-18477",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 447156,
  "published_at": "2026-08-21T18:45:31+00:00"
}