{
  "affected": [
    {
      "database_specific": {
        "source": "https://cna.erlef.org/osv/EEF-CVE-2026-65627.json"
      },
      "package": {
        "ecosystem": "Hex",
        "name": "jose",
        "purl": "pkg:hex/jose"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "1.11.13"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": [
        "1.0.0",
        "1.0.1",
        "1.1.0",
        "1.1.1",
        "1.1.2",
        "1.1.3",
        "1.10.0",
        "1.10.1",
        "1.11.0",
        "1.11.1",
        "1.11.10",
        "1.11.11",
        "1.11.12",
        "1.11.2",
        "1.11.4",
        "1.11.5",
        "1.11.6",
        "1.11.7",
        "1.11.8",
        "1.11.9",
        "1.2.0",
        "1.3.0",
        "1.4.0",
        "1.4.1",
        "1.4.2",
        "1.5.0",
        "1.5.1",
        "1.5.2",
        "1.6.0",
        "1.6.1",
        "1.7.0",
        "1.7.1",
        "1.7.2",
        "1.7.3",
        "1.7.4",
        "1.7.5",
        "1.7.6",
        "1.7.7",
        "1.7.8",
        "1.7.9",
        "1.8.0",
        "1.8.1",
        "1.8.2",
        "1.8.3",
        "1.8.4",
        "1.9.0"
      ]
    },
    {
      "database_specific": {
        "source": "https://cna.erlef.org/osv/EEF-CVE-2026-65627.json"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "a7746ecd4950f85a393136e449a91dac62b5c429"
            },
            {
              "fixed": "857eb8e7f2d33e2c9ca2189e77226561cacaf2ad"
            }
          ],
          "repo": "https://github.com/potatosalad/erlang-jose",
          "type": "GIT"
        }
      ],
      "versions": [
        "1.11.12",
        "1.11.11",
        "1.11.10",
        "1.11.9",
        "1.11.8",
        "1.11.7",
        "1.11.5",
        "1.11.4",
        "1.11.2",
        "1.11.1",
        "1.11.0",
        "1.10.1",
        "1.10.0",
        "1.9.0",
        "1.8.4",
        "1.8.3",
        "1.8.2",
        "1.8.1",
        "1.8.0",
        "1.7.9",
        "1.7.8",
        "1.7.7",
        "1.7.6",
        "1.7.5",
        "1.7.4",
        "1.7.3",
        "1.7.2",
        "1.7.1",
        "1.7.0",
        "1.6.1",
        "1.6.0",
        "1.5.2",
        "1.5.1",
        "1.5.0",
        "1.4.2",
        "1.4.1",
        "1.4.0",
        "1.3.0",
        "1.2.0",
        "1.1.3",
        "1.1.2",
        "1.1.1",
        "1.1.0",
        "1.0.1",
        "1.0.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-65627",
    "GHSA-wfpv-qxp8-x5gm"
  ],
  "credits": [
    {
      "name": "Peter Ullrich",
      "type": "REPORTER"
    },
    {
      "name": "Andrew Bennett",
      "type": "REMEDIATION_DEVELOPER"
    },
    {
      "name": "Jonatan Männchen / EEF",
      "type": "ANALYST"
    }
  ],
  "database_specific": {
    "capec_ids": [
      "CAPEC-130"
    ],
    "cpe_ids": [
      "cpe:2.3:a:potatosalad:jose:*:*:*:*:*:*:*:*"
    ],
    "cwe_ids": [
      "CWE-409"
    ]
  },
  "details": "## Summary\n\nImproper Handling of Highly Compressed Data (Data Amplification) vulnerability in potatosalad jose (erlang-jose) allows a remote attacker to exhaust a node's memory with a small crafted JWE token.\n\nThe `jose_jwe_zip:uncompress/2` function in `src/jwe/jose_jwe_zip.erl` decompresses the DEFLATE-compressed plaintext of a JWE that carries the optional `zip: DEF` header by calling `zlib:inflate/2` on the entire attacker-controlled stream, with no bound on the output size or the inflation ratio. Raw DEFLATE reaches ratios around 1000:1 on highly repetitive input, so a few-kilobyte token inflates to hundreds of megabytes or gigabytes in a single call.\n\nDecompression runs automatically during decryption through `jose_jwe:block_decrypt/2` (`JOSE.JWE.block_decrypt/2` in Elixir), before the recipient can inspect or reject the payload. With the common asymmetric key-management algorithms (RSA-OAEP, ECDH-ES) an attacker needs only the recipient's public key to craft such a token, so no authentication or secret material is required. A single small token can exhaust the node's memory and crash the BEAM, denying service to all users.\n\nThis issue affects jose: from 1.0.0 before 1.11.13.\n\n## Workarounds\n\nReject JWE tokens that carry a `zip` header before passing them to `jose_jwe:block_decrypt/2`. DEFLATE compression is rarely used in legitimate JWE traffic, so untrusted tokens whose protected header contains `zip: DEF` can be inspected and filtered out before decryption.",
  "id": "EEF-CVE-2026-65627",
  "modified": "2026-10-26T20:11:07.749600993Z",
  "published": "2026-10-26T19:53:16.336Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/potatosalad/erlang-jose/security/advisories/GHSA-wfpv-qxp8-x5gm"
    },
    {
      "type": "WEB",
      "url": "https://cna.erlef.org/cves/CVE-2026-65627.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/potatosalad/erlang-jose/commit/a7746ecd4950f85a393136e449a91dac62b5c429"
    },
    {
      "type": "FIX",
      "url": "https://github.com/potatosalad/erlang-jose/commit/857eb8e7f2d33e2c9ca2189e77226561cacaf2ad"
    },
    {
      "type": "PACKAGE",
      "url": "https://hex.pm/packages/jose"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Decompression bomb via unbounded zlib:inflate in jose_jwe_zip:uncompress/2"
}