rustsec-2026-0099

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": null,
        "informational": null,
        "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0099.json"
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "rustls-webpki",
        "purl": "pkg:cargo/rustls-webpki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.103.12"
            },
            {
              "introduced": "0.104.0-alpha.1"
            },
            {
              "fixed": "0.104.0-alpha.6"
            }
          ],
          "type": "SEMVER"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-93601",
    "GHSA-xgp8-3hg3-c2mh"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Permitted subtree name constraints for DNS names were accepted for certificates asserting a wildcard name.\n\nThis was incorrect because, given a name constraint of `accept.example.com`, `*.example.com` could feasibly allow a name of `reject.example.com` which is outside the constraint.\nThis is very similar to [CVE-2025-61727](https://go.dev/issue/76442).\n\nSince name constraints are restrictions on otherwise properly-issued certificates, this bug is reachable only after signature verification and requires misissuance to exploit.\n\nThis vulnerability is identified as [GHSA-xgp8-3hg3-c2mh](https://github.com/rustls/webpki/security/advisories/GHSA-xgp8-3hg3-c2mh). Thank you to [@1seal](https://github.com/1seal) for the report.",
  "id": "RUSTSEC-2026-0099",
  "modified": "2026-09-19T08:42:27Z",
  "published": "2026-04-14T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/rustls-webpki"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0099.html"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Name constraints were accepted for certificates asserting a wildcard name"
}