{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c"
            },
            {
              "fixed": "8a14632ca6ba8a8afd2a3f2098bc267c13e13d93"
            }
          ],
          "repo": "https://github.com/hexpm/hex",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-98jr-23pm-vj7c"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-354"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105280.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "0.20.2"
          },
          {
            "fixed": "2.5.2"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Improper Validation of Integrity Check Value vulnerability in hexpm hex allows a package mirror to substitute the tarball that mix hex.package fetch PACKAGE VERSION --output - writes to standard output.\n\nHex compares a fetched tarball's inner and outer checksums with the repository's signed registry before writing it to a file or unpacking it. The standard output branch of mix hex.package fetch writes the bytes returned by Hex.SCM.fetch/3 without that comparison, and Hex.SCM.fetch/3 doesn't verify freshly downloaded tarballs itself. When a mirror configured with HEX_MIRROR_URL or mirror_url serves altered bytes, the command prints them and exits successfully, while the same fetch with --output FILE fails with a checksum mismatch.\n\nHex also prints diagnostics to standard output while the command runs: the body of a failed HTTP response from the update check or a registry fetch, and API warnings from the x-hex-message header. A mirror that answers one of those requests with an error whose body is a tar archive gets that archive written to standard output ahead of the verified tarball, so a pipeline that unpacks standard output extracts the mirror's files. This happens even when the checksum check then fails, because the archive is already on standard output.\n\nThis issue affects hex: from 0.20.2 before 2.5.2.",
  "id": "CVE-2026-105280",
  "modified": "2026-10-13T02:31:03.275566443Z",
  "published": "2026-10-12T15:30:14.126Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-105280.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105280.json"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hexpm/hex"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hexpm/hex/commit/69489f8b74213f03db10169e6e5407e6d5fee512"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hexpm/hex/commit/8a14632ca6ba8a8afd2a3f2098bc267c13e13d93"
    },
    {
      "type": "FIX",
      "url": "https://github.com/hexpm/hex/commit/d1f5a085d9d4748e1f7d195e4bc39ebd77c28d9c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/hexpm/hex/security/advisories/GHSA-98jr-23pm-vj7c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105280"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-105280"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Hex writes unverified package tarballs to standard output in mix hex.package fetch"
}