{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.12.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4fd0c70a3f207c618b145934792f791bccfb39f8"
            },
            {
              "fixed": "71ae23be5448f859c2b4e21d9972ddfa7b8d759d"
            }
          ],
          "repo": "https://github.com/pydantic/httpx2",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8xx6-hgc6-gc2m"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-409"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84382.json"
  },
  "details": "HTTPX2 is a next generation HTTP client for Python. Prior to 2.12.0, the HTTPX2 content decoders in src/httpx2/httpx2/_decoders.py fully inflate each gzip, deflate, br, or zstd network chunk before iter_bytes() or aiter_bytes() yields bounded pieces to the application. A 64 KiB compressed chunk can expand to approximately 64 MiB in one intermediate allocation, so an attacker-controlled or compromised server can cause severe memory pressure or out-of-memory process termination even when the application streams the response. This issue is fixed in version 2.12.0.",
  "id": "CVE-2026-84382",
  "modified": "2026-09-05T03:30:42.492117557Z",
  "published": "2026-09-02T18:03:05.010Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pydantic/httpx2/releases/tag/v2.12.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84382.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84382"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pydantic/httpx2/pull/1126"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)"
}