CVE-2026-84382
highHTTPX2 is a next generation HTTP client for Python.
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/pydantic/httpx2/commit/4fd0c70a3f207c618b145934792f791bccfb39f8 security-advisories@github.com
- https://github.com/pydantic/httpx2/pull/1126 security-advisories@github.com
- https://github.com/pydantic/httpx2/releases/tag/v2.12.0 security-advisories@github.com
- https://github.com/pydantic/httpx2/security/advisories/GHSA-8xx6-hgc6-gc2m security-advisories@github.com