UNKNOWN READ in hobbes::castexp::apply

{
  "id": "c164be98009643129e367c8e0145ba1e7ee583409dc1a92cf180574b93b44733",
  "url": "https://osv.dev/vulnerability/OSV-2026-1408",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UNKNOWN READ in hobbes::castexp::apply",
    "summary": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=573787443 ``` Crash type: UNKNOWN READ Crash state: hobbes::castexp::apply hobbes::compileExpF::with llvm::Value* hobbes::switchOfF co ```",
    "evidence": "osv:OSV-2026-1408",
    "products": [
      {
        "name": {
          "value": "hobbes",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "OSV-2026-1408",
      "aliases": [
        "OSV-2026-1408"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/morganstanley/hobbes.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b04da9e612f6d0bdd9d691c0396ae481dbfc6da9"
                },
                {
                  "fixed": "bff061afc31cfc460f38dd9c5c4b754b72b88de5"
                },
                {
                  "fixed": "9075bea5a20e069eece29c82d7df1e80ac1429f6"
                }
              ]
            }
          ],
          "package": {
            "name": "hobbes",
            "purl": "pkg:generic/hobbes",
            "ecosystem": "OSS-Fuzz"
          },
          "database_specific": {
            "source": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/hobbes/OSV-2026-1408.yaml",
            "fixed_range": "c5d24a6d8c5b35e060dee8396cb6a9f09d11313e:9075bea5a20e069eece29c82d7df1e80ac1429f6",
            "introduced_range": "4b2dbb6cedaee900267471349b3b9ac4098d3d20:f06eb2bd471181093c3f68a09b29bbdb0120e99f"
          },
          "ecosystem_specific": {
            "severity": "MEDIUM"
          }
        }
      ],
      "modified": "2026-10-19T15:18:25.885644Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=573787443"
      ]
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 375317,
  "published_at": "2026-10-17T00:03:42.537606+00:00"
}