CVE-2026-4177 affecting package perl-YAML 1.30-2

{
  "id": "1c4ce7c19905e1547a064bb272b22f4ce6f80347dde0ebbde9160e8d32905170",
  "url": "https://osv.dev/vulnerability/AZL-109508",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-4177 affecting package perl-YAML 1.30-2",
    "summary": "YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter. The heap overflow occurs when class names exceed the initial 512-byte allocation. The base64 decoder could read past the buffer end on trailing newlines. strtok mutated n->type_id in place, corrupting shared node data. A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.",
    "evidence": "osv:AZL-109508",
    "products": [
      {
        "name": {
          "value": "perl-YAML",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-109508",
      "aliases": [
        "AZL-109508"
      ],
      "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-109508.json"
          }
        }
      ],
      "modified": "2026-10-27T05:36:16Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-4177"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-4177"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-4177",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 460464,
  "published_at": "2026-03-16T23:16:21+00:00"
}