{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.1.1"
              },
              {
                "fixed": "1.0.4"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "9df2bf5d76e210d7da2402bce29498c5bf620ebf"
            },
            {
              "fixed": "8d9c57ab94651b3f076871eebe3b70fa208fe3e3"
            },
            {
              "fixed": "1ba4bb2dc91e80089cf89c73970ac3ded76f17eb"
            }
          ],
          "repo": "https://github.com/elixir-mint/hpax",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jj2p-32j7-whj2"
  ],
  "database_specific": {
    "cna_assigner": "EEF",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58226.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "56db437a7e2c515e3bdd770ac7947b02cd2390d0"
          },
          {
            "fixed": "1ba4bb2dc91e80089cf89c73970ac3ded76f17eb"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding.\n\nhpax decodes HPACK variable-length integers with no upper bound on the decoded value or the number of continuation octets. 'Elixir.HPAX.Types':decode_remaining_integer/3 accumulates the integer as int + (value \u003c\u003c\u003c m), shifting by 7 more bits for each continuation octet and stopping only on a terminating octet or truncated input, never because the integer grew too large. Because BEAM integers are arbitrary precision, a run of N continuation octets builds an O(N)-bit bignum and re-adds into an ever-larger bignum on each step, so the total decoding cost is superlinear (about O(N^2)). An unauthenticated attacker who can send an HTTP/2 header block to a server using this decoder (reached through the 'Elixir.HPAX':decode/2 entry point) can supply a small header block that forces a large, attacker-controlled amount of CPU (and transient memory), a denial-of-service amplification.\n\nThis issue affects hpax from 0.1.1 before 1.0.4.",
  "id": "CVE-2026-58226",
  "modified": "2026-07-15T01:49:04.146144890Z",
  "published": "2026-07-06T09:03:47.374Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-58226.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-58226"
    },
    {
      "type": "WEB",
      "url": "https://repo.hex.pm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58226.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/elixir-mint/hpax/security/advisories/GHSA-jj2p-32j7-whj2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58226"
    },
    {
      "type": "FIX",
      "url": "https://github.com/elixir-mint/hpax/commit/1ba4bb2dc91e80089cf89c73970ac3ded76f17eb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/elixir-mint/hpax"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unauthenticated denial-of-service via unbounded HPACK integer decoding in hpax"
}