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CVE-2026-84379— HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers

Quick assessment

Affected
pydantic httpx2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是该漏洞描述信息的中文翻译： HTTPX2 是一个 Python 的下一代 HTTP 客户端。在 2.11.0 版本之前，位于 中的 方法直接将攻击者可控的 值以及通过 参数传入的自定义头部内容（包括三元素元组 和四元素元组 ）直接拼接到 multipart/form-data 部件的头部中，且未对头部名称或值进行验证。 攻击者可利用其中的回车（CR）或换行（LF）字符来提前终止部件头部、注入额外的部件头部，或提前结束部件头部块，从而使得下游的 multipart 解析器将攻击者提供的行视为有效头部，进而改变部

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
pydantic httpx2 < 2.11.0 affected
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I. Basic Information for CVE-2026-84379

Vulnerability Information
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Vulnerability Title
HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pydantic httpx2 < 2.11.0 -

II. Public POCs for CVE-2026-84379

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III. Intelligence Information for CVE-2026-84379

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Patches & Fixes for CVE-2026-84379 (3)

Vendor Advisories for CVE-2026-84379 (1)

Same Patch Batch · pydantic · 2026-09-02 · 5 CVEs total

CVE-2026-84381 8.1 HIGH HTTPX2: Secure WebSocket traffic sent without TLS through SOCKS proxies
CVE-2026-84382 7.5 HIGH HTTPX2: Streaming response decompression does not bound peak memory (decompression amplifi
CVE-2026-84378 5.9 MEDIUM HTTPX2: Quadratic SSE line buffering can cause CPU denial of service
CVE-2026-84380 5.6 MEDIUM HTTPX2: Conflicting Content-Length and Transfer-Encoding headers can be auto-generated

IV. Related Vulnerabilities

Same product: httpx2
Same vendor: pydantic
Same weakness: CWE-93

V. Comments for CVE-2026-84379

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