CVE-2026-1502 | Python CPython up to 3.14.x HTTP Client Proxy Tunnel crlf injection (ID 146211)

VDB-356914 · CVE-2026-1502 · ID 146211 PYTHON CPYTHON UP TO 3.14.X HTTP CLIENT PROXY TUNNEL CRLF INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.5 $0-$5k 1.05+ Summaryinfo A vulnerability described as problematic has been identified in Python CPython up to 3.14.x. This affects an unknown function of the component HTTP Client Proxy Tunnel Handler. Executing a manipulation can lead to crlf injection. The identification of this vulnerability is CVE-2026-1502. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended. Detailsinfo A vulnerability classified as problematic was found in Python CPython up to 3.14.x. This vulnerability affects an unknown code block of the component HTTP Client Proxy Tunnel Handler. The manipulation with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes: CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host. The advisory is available at github.com. This vulnerability was named CVE-2026-1502 since 01/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not available. Upgrading to version 3.15.0 eliminates this vulnerability. Applying the patch 05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-21519). Productinfo Type Programming Language Software Vendor Python Name CPython Version 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 License open-source Website Product: https://github.com/python/cpython/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 4.7 VulDB Meta Temp Score: 4.5 VulDB Base Score: 4.7 VulDB Temp Score: 4.5 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Crlf injection CWE: CWE-93 / CWE-74 / CWE-707 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: CPython 3.15.0 Patch: 05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69 Timelineinfo 01/27/2026 CVE reserved 04/10/2026 +72 days Advisory disclosed 04/10/2026 +0 days VulDB entry created 04/10/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: 146211 Status: Confirmed CVE: CVE-2026-1502 (🔒) GCVE (CVE): GCVE-0-2026-1502 GCVE (VulDB): GCVE-100-356914 EUVD: 🔒 Entryinfo Created: 04/10/2026 20:38 Updated: 04/10/2026 21:55 Changes: 04/10/2026 20:38 (71), 04/10/2026 21:55 (1) Complete: 🔍 Cache ID: 99:782:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸