CVE-2026-57075 affecting package perl-YAML 1.30-2

{
  "id": "bba39c93c14137ce844a595f868de32af7df7d937176f87a394f6605384ad52d",
  "url": "https://osv.dev/vulnerability/AZL-109517",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-57075 affecting package perl-YAML 1.30-2",
    "summary": "YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec. The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path. Any caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result.",
    "evidence": "osv:AZL-109517",
    "products": [
      {
        "name": {
          "value": "perl-YAML",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-109517",
      "aliases": [
        "AZL-109517"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "1.30-2"
                }
              ]
            }
          ],
          "package": {
            "name": "perl-YAML",
            "purl": "pkg:rpm/azure-linux/perl-YAML",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-109517.json"
          }
        }
      ],
      "modified": "2026-10-27T05:36:16Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-57075"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-57075"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-57075",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 460472,
  "published_at": "2026-07-16T22:17:43+00:00"
}