CVE-2026-84382

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Source
https://cve.org/CVERecord?id=CVE-2026-84382
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84382.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-84382
Aliases
Downstream
Published
2026-09-02T18:03:05Z
Modified
2026-09-05T03:30:42Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
HTTPX2: Streaming response decompression does not bound peak memory (decompression amplification)
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.

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"
}
References

Affected packages

Git / github.com/pydantic/httpx2

Affected ranges

Type
GIT
Repo
https://github.com/pydantic/httpx2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
4fd0c70a3f207c618b145934792f791bccfb39f8
Fixed
71ae23be5448f859c2b4e21d9972ddfa7b8d759d
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.12.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v2.*
v2.0.0
v2.0.0b1
v2.1.0
v2.10.0
v2.11.0
v2.2.0
v2.3.0
v2.4.0
v2.5.0
v2.6.0
v2.7.0
v2.8.0
v2.9.0
v2.9.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84382.json"