{"cve":"CVE-2026-84382","nvd":{"published":"2026-09-02T19:18:08.353","modified":"2026-09-09T21:05:23.237","status":"Awaiting Analysis","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-409"],"references":["https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8","https://github.com/pydantic/httpx2/pull/1126","https://github.com/pydantic/httpx2/releases/tag/v2.12.0","https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-84382","score":0.0063,"percentile":0.502,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8xx6-hgc6-gc2m","url":"https://osv.dev/vulnerability/GHSA-8xx6-hgc6-gc2m","summary":"HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)","modified":"2026-09-10T12:26:04.899389228Z","packages":[{"ecosystem":"PyPI","name":"httpx2","purl":"pkg:pypi/httpx2","ranges":["<2.12.0"],"fixed":["2.12.0"]}]},{"id":"PYSEC-2026-3846","url":"https://osv.dev/vulnerability/PYSEC-2026-3846","summary":"HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)","modified":"2026-09-10T12:15:05.042801702Z","packages":[{"ecosystem":"PyPI","name":"httpx2","purl":"pkg:pypi/httpx2","ranges":["<2.12.0"],"fixed":["2.12.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}