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CVE-2025-1795— Mishandling of comma during folding and unicode-encoding of email headers

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，该漏洞源于地址列表折叠时逗号被Unicode编码，可能导致邮件服务器误解地址头。

CVSS 2.3 · Low EPSS 0.63% · P48

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.9.23 affected
3.10.0< 3.10.17 affected
3.11.0< 3.11.9 affected
3.12.0< 3.12.3 affected
3.13.0a1< 3.13.0a5 affected
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I. Basic Information for CVE-2025-1795

Vulnerability Information
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Vulnerability Title
Mishandling of comma during folding and unicode-encoding of email headers
Source: CVE Program / CVE List V5
Vulnerability Description
During an address list folding when a separating comma ends up on a folded line and that line is to be unicode-encoded then the separator itself is also unicode-encoded. Expected behavior is that the separating comma remains a plan comma. This can result in the address header being misinterpreted by some mail servers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/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，该漏洞源于地址列表折叠时逗号被Unicode编码，可能导致邮件服务器误解地址头。
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 ~ 3.9.23 -

II. Public POCs for CVE-2025-1795

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III. Intelligence Information for CVE-2025-1795

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Patches & Fixes for CVE-2025-1795 (5)

Vendor Advisories for CVE-2025-1795 (1)

Other References for CVE-2025-1795 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2025-1795

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