CVE-2026-84379

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Source
https://cve.org/CVERecord?id=CVE-2026-84379
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84379.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-84379
Aliases
Downstream
Published
2026-09-02T17:57:17Z
Modified
2026-09-11T03:30:33Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers
Details

HTTPX2 is a next generation HTTP client for Python. Prior to 2.11.0, FileField.render_headers() in src/httpx2/httpx2/_multipart.py directly interpolates attacker-controlled content_type values and custom headers from the files= three-element (filename, content, content_type) tuple and the files= four-element (filename, content, content_type, headers) tuple into multipart/form-data part headers without validating header names or values. CR or LF characters can terminate a part header, inject additional part headers, or end the part header block early, allowing a downstream multipart parser to treat attacker-supplied lines as genuine headers and potentially alter part semantics or bypass header-based checks. This issue is fixed in version 2.11.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-93"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84379.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
de96d810ee4e309d118982fe7084a46a2bcd600d
Fixed
2b13fa92e4181d5e0f56772205360b2aa12f109d
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.11.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v2.*
v2.0.0
v2.0.0b1
v2.1.0
v2.10.0
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-2026-84379.json"