{
  "cveId": "CVE-2026-103503",
  "url": "https://patchblox.com/security/cve/CVE-2026-103503",
  "summary": "CVE-2026-103503 is fixed in erlang-hex on 1 platform by DEBIAN-CVE-2026-103503 (version 2.5.3-2), released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "erlang-hex: Improper Certificate Validation vulnerability in hexpm hex allows an attacker who can intercept HTTPS connections, an...",
  "description": "Improper Certificate Validation vulnerability in hexpm hex allows an attacker who can intercept HTTPS connections, and holds a certificate for a Hex host issued by a CA in Hex\u0027s bundled CA store, to impersonate that host to users who set cacerts_path to a CA store that leaves that CA out.  cacerts_path (HEX_CACERTS_PATH) is documented as the path to the CA certificate store, used instead of the CA bundle that ships with Hex. Hex.HTTP.SSL.ssl_opts/1 passes the configured store as the cacerts option, but builds the partial_chain callback from the bundled store whether cacerts_path is set or not. Hex.HTTP.SSL.partial_chain/2 accepts a server chain when any certificate in it has the same public key as a bundled CA certificate, so a chain that leads to a bundled CA passes verification although the configured store doesn\u0027t contain that CA. Hostname verification still applies.  This issue affects hex: from 0.20.2 before 2.5.2.",
  "published": "2026-10-12T16:17:02Z",
  "severity": "",
  "epss": 0.00207,
  "epssPercentile": 0.10825,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "erlang-hex",
      "release": "Debian 14",
      "fixedVersion": "2.5.3-2",
      "fix": "DEBIAN-CVE-2026-103503",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-103503",
      "released": "2026-10-24T13:25:57Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T07:50:38Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}