CVE-2026-3446 | Python CPython up to 3.13.12/3.14.3/3.15.0a7 b64decode

VDB-356919 · CVE-2026-3446 · GCVE-0-2026-3446 PYTHON CPYTHON UP TO 3.13.12/3.14.3/3.15.0A7 B64DECODE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.0 $0-$5k 1.31+ Summaryinfo A vulnerability has been found in Python CPython up to 3.13.12/3.14.3/3.15.0a7 and classified as problematic. This affects the function b64decode. Performing a manipulation results in an unknown weakness. This vulnerability is cataloged as CVE-2026-3446. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded. Detailsinfo A vulnerability was found in Python CPython up to 3.13.12/3.14.3/3.15.0a7. It has been classified as problematic. This is going to have an impact on integrity. The summary by CVE is: When calling base64.b64decode() or related functions the decoding process would stop after encountering the first padded quad regardless of whether there was more information to be processed. This can lead to data being accepted which may be processed differently by other implementations. Use "validate=True" to enable stricter processing of base64 data. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-3446 since 03/02/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 3.13.13, 3.14.4 or 3.15.0a8 eliminates this vulnerability. Productinfo Type Programming Language Software Vendor Python Name CPython Version 3.13.0 3.13.1 3.13.2 3.13.3 3.13.4 3.13.5 3.13.6 3.13.7 3.13.8 3.13.9 3.13.10 3.13.11 3.13.12 3.14.0 3.14.1 3.14.2 3.14.3 3.15.0a7 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: 3.1 VulDB Meta Temp Score: 3.0 VulDB Base Score: 3.1 VulDB Temp Score: 3.0 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: Unknown CWE: Unknown 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 3.13.13/3.14.4/3.15.0a8 Timelineinfo 03/02/2026 CVE reserved 04/10/2026 +38 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: github.com Status: Confirmed CVE: CVE-2026-3446 (🔒) GCVE (CVE): GCVE-0-2026-3446 GCVE (VulDB): GCVE-100-356919 Entryinfo Created: 04/10/2026 20:40 Changes: 04/10/2026 20:40 (66) Complete: 🔍 Cache ID: 99:305:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸