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CVE-2026-103995— Lenient parsing of integers for response body and chunk framing

Quick assessment

Affected
Python Software Foundation CPython
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.

响应正文和分块（chunk）解析逻辑会错误地处理非十六进制或负整数，这可能导致 HTTP 响应内容被错误解读。

CVSS 2.0 · Low EPSS 0.36% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.16.0 affected
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I. Basic Information for CVE-2026-103995

Vulnerability Information
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Vulnerability Title
Lenient parsing of integers for response body and chunk framing
Source: CVE Program / CVE List V5
Vulnerability Description
Response body and chunk parsing would handle non-hex or negative integers incorrectly which could result in misinterpreting HTTP response contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Software Foundation CPython 0 ~ 3.16.0 -

II. Public POCs for CVE-2026-103995

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103995

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Patches & Fixes for CVE-2026-103995 (3)

Other References for CVE-2026-103995 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation
Same weakness: CWE-444