{"id":"CVE-2026-84382","title":"HTTPX2 is a next generation HTTP client for Python","summary":"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 bo…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-409"],"vendor":"httpx2","product":"httpx2","affected":["httpx2 < 2.12.0"],"patched":["httpx2 2.12.0"],"published":"2026-09-02","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:05:23.237","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84382","references":[{"url":"https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8","label":"security-advisories@github.com"},{"url":"https://github.com/pydantic/httpx2/pull/1126","label":"security-advisories@github.com"},{"url":"https://github.com/pydantic/httpx2/releases/tag/v2.12.0","label":"security-advisories@github.com"},{"url":"https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84382"},{"url":"https://github.com/pydantic/httpx2"},{"url":"https://github.com/advisories/GHSA-8xx6-hgc6-gc2m"},{"url":"https://pypi.org/project/httpx2"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84382.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-84382"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2527702"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84382"}],"tags":["nvd","osv","pip","ghsa","csaf","vex","red-hat"],"epss":0.0035,"epssPercentile":0.28634,"aliases":["GHSA-8xx6-hgc6-gc2m","PYSEC-2026-3846"],"ecosystem":"pip","ingestedAt":"2026-09-08T21:11:12.322Z","slug":"CVE-2026-84382","body":"## Overview\n\nHTTPX2 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-84382)\n\nAffected packages:\n\n- `httpx2 < 2.12.0`\n\nPatched in:\n\n- `httpx2 2.12.0`\n\nSource: https://osv.dev/vulnerability/GHSA-8xx6-hgc6-gc2m\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Lightspeed Core, Red Hat OpenShift AI (RHOAI) · no fix planned: Lightspeed Core, Red Hat OpenShift AI (RHOAI) · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84382.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}