IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID

{
  "id": "89f0aaf1f1ae4bc7a90c6d38a15e5d361a2e9c78c454e86994062ad4a93a38f2",
  "url": "https://osv.dev/vulnerability/CVE-2026-48961",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID",
    "summary": "IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID. When decode_ux() in bin/zipdetails handles an Info-ZIP Unix Extra Field (tag 0x7875) with UID Size or GID Size set to 8, causing zipdetails to decode an 8-byte UID or GID value, it dispatches through decodeLitteEndian(), which calls a misnamed helper unpackValueQ. The actual function defined in the same file is unpackValue_Q (with underscore); the call raises 'Undefined subroutine &main::unpackValueQ' and the script exits with status 255. Library callers of IO::Compress and IO::Uncompress are not affected; the defect is in the bundled CLI tool.",
    "evidence": "osv:CVE-2026-48961",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-48961",
      "aliases": [
        "CVE-2026-48961"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/pmqs/io-compress",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ddfe67584a228877e5d28840da75ff32e435a5e3"
                },
                {
                  "fixed": "f1979570091697409f4792e5d401bbf8fb4b20b6"
                },
                {
                  "fixed": "33c89d03d6e746ed2ead4f2f6570d47864c61bc7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.207"
                      },
                      {
                        "fixed": "2.220"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "33c89d03d6e746ed2ead4f2f6570d47864c61bc7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.219",
            "v2.218",
            "v2.217",
            "v2.216",
            "v2.215",
            "v2.214",
            "v2.213",
            "v2.212",
            "v2.211",
            "v2.208",
            "v2.207"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48961.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.680766877Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48961.json",
        "https://metacpan.org/release/PMQS/IO-Compress-2.220/changes",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-48961",
        "https://github.com/pmqs/IO-Compress/commit/33c89d03d6e746ed2ead4f2f6570d47864c61bc7.patch",
        "https://github.com/pmqs/IO-Compress"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-755"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48961.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-48961",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520320,
  "published_at": "2026-05-27T02:34:52.228+00:00"
}