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CVE-2025-11468— Folding email comments of unfoldable characters doesn't preserve parenthesis

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.

CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在安全漏洞，该漏洞源于折叠仅包含不可折叠字符的电子邮件标头中的长注释时未保留括号，可能导致在用户控制且未清理的地址中注入标头。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process
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I. Basic Information for CVE-2025-11468

Vulnerability Information
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Vulnerability Title
Folding email comments of unfoldable characters doesn't preserve parenthesis
Source: CVE Program / CVE List V5
Vulnerability Description
When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
CPython 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在安全漏洞，该漏洞源于折叠仅包含不可折叠字符的电子邮件标头中的长注释时未保留括号，可能导致在用户控制且未清理的地址中注入标头。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Python Software Foundation CPython 0 ~ 3.10.20 -

II. Public POCs for CVE-2025-11468

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III. Intelligence Information for CVE-2025-11468

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Patches & Fixes for CVE-2025-11468 (1)

Same Patch Batch · Python Software Foundation · 2026-01-20 · 6 CVEs total

CVE-2025-15366 5.9 MEDIUM IMAP command injection in user-controlled commands
CVE-2026-0865 wsgiref.headers.Headers allows header newline injection
CVE-2025-15367 POP3 command injection in user-controlled commands
CVE-2025-15282 Header injection via newlines in data URL mediatype
CVE-2026-0672 Header injection in http.cookies.Morsel

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2025-11468

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