Use-After-Free and Double-Free in IntoIter::drop when element drop panics

{
  "id": "0b4431c6a4cd39df86c411a1a734d27f61df4570e197607f13442ebb641dc594",
  "url": "https://osv.dev/vulnerability/CVE-2026-6654",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Use-After-Free and Double-Free in IntoIter::drop when element drop panics",
    "summary": "Double-Free / Use-After-Free (UAF) in the `IntoIter::drop` and `ThinVec::clear` functions in the thin_vec crate. A panic in `ptr::drop_in_place` skips setting the length to zero.",
    "evidence": "osv:CVE-2026-6654",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-6654",
      "aliases": [
        "CVE-2026-6654",
        "GHSA-xphw-cqx3-667j",
        "RUSTSEC-2026-0103"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mozilla/thin-vec",
              "type": "GIT",
              "events": [
                {
                  "introduced": "70bcca0960a7e11056fa3281445d08052421dab5"
                },
                {
                  "last_affected": "70bcca0960a7e11056fa3281445d08052421dab5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mozilla:thin-vec:0.2.15:*:*:*:*:rust:*:*",
                    "range": [
                      {
                        "introduced": "0.2.15"
                      },
                      {
                        "last_affected": "0.2.15"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.2.15",
            "v0.2.15"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6654.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.069681478Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6654.json",
        "https://access.redhat.com/security/cve/CVE-2026-6654",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6654.json",
        "https://github.com/mozilla/thin-vec/security/advisories/GHSA-xphw-cqx3-667j",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-6654",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2459689"
      ],
      "provider_metadata": {
        "cna_assigner": "mozilla",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6654.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-6654",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492279,
  "published_at": "2026-04-20T10:05:52.339+00:00"
}