CVE-2026-1502: Vulnerability in Python Software Foundation CPython
CVE-2026-1502 is a medium severity vulnerability in the Python Software Foundation's CPython implementation where CR/LF bytes were not rejected in HTTP client proxy tunnel headers or host fields. This could potentially allow injection or manipulation of HTTP headers. The vulnerability has a CVSS 4. 0 base score of 5. 7, indicating a moderate impact. There is no vendor advisory or patch information available at this time, and no known exploits in the wild have been reported.
AI Analysis
Technical Summary
This vulnerability involves improper handling of carriage return and line feed (CR/LF) characters in HTTP client proxy tunnel headers or host fields within CPython. The failure to reject these bytes could lead to HTTP header injection or related issues. The CVSS 4.0 vector indicates network attack vector, low attack complexity, partial privileges required, partial user interaction, and high impact on integrity and availability. No official remediation or patch has been documented yet.
Potential Impact
The vulnerability could allow an attacker with some privileges and user interaction to manipulate HTTP headers, potentially impacting the integrity and availability of affected systems using CPython. However, no known exploits have been reported, and the overall severity is medium.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should monitor official Python Software Foundation communications for updates. No specific mitigations are documented at this time.
CVE-2026-1502: Vulnerability in Python Software Foundation CPython
Description
CVE-2026-1502 is a medium severity vulnerability in the Python Software Foundation's CPython implementation where CR/LF bytes were not rejected in HTTP client proxy tunnel headers or host fields. This could potentially allow injection or manipulation of HTTP headers. The vulnerability has a CVSS 4. 0 base score of 5. 7, indicating a moderate impact. There is no vendor advisory or patch information available at this time, and no known exploits in the wild have been reported.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper handling of carriage return and line feed (CR/LF) characters in HTTP client proxy tunnel headers or host fields within CPython. The failure to reject these bytes could lead to HTTP header injection or related issues. The CVSS 4.0 vector indicates network attack vector, low attack complexity, partial privileges required, partial user interaction, and high impact on integrity and availability. No official remediation or patch has been documented yet.
Potential Impact
The vulnerability could allow an attacker with some privileges and user interaction to manipulate HTTP headers, potentially impacting the integrity and availability of affected systems using CPython. However, no known exploits have been reported, and the overall severity is medium.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should monitor official Python Software Foundation communications for updates. No specific mitigations are documented at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- PSF
- Date Reserved
- 2026-01-27T19:10:37.711Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d93c061cc7ad14dada4d46
Added to database: 4/10/2026, 6:05:58 PM
Last enriched: 4/10/2026, 6:21:17 PM
Last updated: 4/10/2026, 8:15:03 PM
Views: 4
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