Answer in brief
CVE-2026-84382 records a High severity (CVSS 7.5) vulnerability in HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification). The current sources do not mark it as known exploited. The current feed maps pydantic/httpx2 (generic), httpx2 (pip), httpx2 (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps pydantic/httpx2 (generic), httpx2 (pip), httpx2 (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| pydantic/httpx2generic | < 2.12.0 | Not reported |
| httpx2pip | <2.12.0 | 2.12.0 |
| httpx2pypi | >=0 <2.12.0 | 2.12.0 |
Published upstream
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 2, 2026
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.
Quoted source text, attributed separately from HOL analysis.