Segv on unknown address in Sass::CompoundSelector::resolve_parent_refs

{
  "id": "40079c50948d610c2678a182641d7257c4ce14c4ff89f6e8170bddfab608d1d1",
  "url": "https://osv.dev/vulnerability/OSV-2021-508",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Segv on unknown address in Sass::CompoundSelector::resolve_parent_refs",
    "summary": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31832 ``` Crash type: Segv on unknown address Crash state: Sass::CompoundSelector::resolve_parent_refs Sass::ComplexSelector::resolve_parent_refs Sass::SelectorList::resolve_parent_refs ```",
    "evidence": "osv:OSV-2021-508",
    "products": [
      {
        "name": {
          "value": "libsass",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.6.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "3.6.6",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "OSV-2021-508",
      "aliases": [
        "OSV-2021-508"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/sass/libsass.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f964dcddd76f4c1f00da06bfd905be790618c33b"
                }
              ]
            }
          ],
          "package": {
            "name": "libsass",
            "purl": "pkg:generic/libsass",
            "ecosystem": "OSS-Fuzz"
          },
          "versions": [
            "3.6.2",
            "3.6.3",
            "3.6.4",
            "3.6.5",
            "3.6.6"
          ],
          "database_specific": {
            "source": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libsass/OSV-2021-508.yaml"
          }
        }
      ],
      "modified": "2026-10-19T14:16:47.872103Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31832"
      ]
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 374773,
  "published_at": "2021-03-09T00:02:18.581527+00:00"
}