python security

About this tag
The python security tag on WindowsForum.com covers vulnerabilities and security issues in the Python ecosystem, including the CPython standard library and popular third-party packages. Recent discussions focus on command injection in Click, path traversal in pkgutil, header injection in http.cookies, denial-of-service flaws in Werkzeug and urllib3, zip bombs in zipfile, remote code execution in Azure Core Python, and TOCTOU race conditions in filelock. These threads provide technical analysis, patch guidance, and risk assessment for developers and IT professionals managing Python environments on Windows and other platforms.

  1. Microsoft VS Code Python Dependency Remediation: AI Fixes Vulnerable Packages

    Microsoft has built and begun externalizing an AI-powered Visual Studio Code extension called Python Dependency Remediation to help its developers, and eventually the wider Python community, identify vulnerable Python packages, upgrade dependency chains, and repair breaking code changes inside...
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    • dependency remediation python security software supply chain vs code extension
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    • Forum: Windows News

  2. CVE-2026-7246 Click edit Command Injection: Patch Click 8.3.3+ to stop Shell escapes

    CVE-2026-7246 is a high-severity command-injection flaw disclosed April 30, 2026, in Pallets Click’s click.edit() helper, affecting Python package versions before 8.3.3 and allowing attacker-controlled filenames to escape quoting and run operating-system commands on the user’s local machine. The...
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    • command injection cve 2026-7246 pallets click python security
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    • Forum: Security Alerts

  3. CVE-2026-3479: pkgutil.get_data Path Traversal Fix in CPython

    A newly disclosed Python security issue, tracked as CVE-2026-3479, shows that pkgutil.get_data() did not enforce the path-safety rules its documentation promised. In practice, that meant callers could pass resource names that enabled path traversal instead of being constrained to a...
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    • cpython patch cve-2026-3479 path traversal python security
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    • Forum: Security Alerts

  4. CVE-2026-3644: Python http.cookies Control Character Bug and Header Injection Risk

    The Microsoft Security Response Center page for CVE-2026-3644 currently appears to be unavailable, but the underlying issue is not mysterious: it points to incomplete control character validation in Python’s http.cookies module, a class of bug that can let attacker-controlled cookie data bleed...
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    • cve 2026 3644 http header injection python security windows patch management
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    • Forum: Security Alerts

  5. CVE-2023-46136: Patch Werkzeug multipart DoS to keep services online

    A deceptively small parsing flaw in the popular Python WSGI utility library Werkzeug can be turned into a powerful denial-of-service weapon: specially crafted multipart/form-data uploads that start with a carriage return (CR) or line feed (LF), followed by megabytes of data without additional...
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    • dos attack python security web security werkzeug
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    • Forum: Security Alerts

  6. CVE-2024-0450: Patch Stops Quoted Overlap Zip Bombs in Python ZipFile

    The discovery and coordinated patching of CVE-2024-0450 closes a subtle but consequential gap in CPython’s zipfile module: quoted‑overlap zip‑bombs that can weaponize compliant ZIP metadata to force excessive, asymmetric resource consumption during extraction. The Python Security Team, upstream...
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    • cpython zipfile cve 2024 0450 python security zip bomb
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    • Forum: Security Alerts

  7. Understanding CVE-2026-21226: Azure Core Python RCE Risk and Mitigation

    A Microsoft Security Response Center (MSRC) entry now lists CVE-2026-21226 — a reported remote code execution (RCE) class vulnerability in the Azure Core shared client library for Python — but public technical detail is limited and the vendor’s own “confidence” metric indicates the disclosure is...
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    • azure core cve 2026 21226 python security vendor advisories
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    • Forum: Security Alerts

  8. CVE-2025-68146 TOCTOU in filelock: upgrade to 3.20.1 now

    filelock, the widely used platform‑independent file‑locking library for Python, is the subject of a newly public vulnerability — CVE‑2025‑68146 — that exposes a classic Time‑of‑Check‑Time‑of‑Use (TOCTOU) race condition in lock file creation. The flaw allows a local attacker who can create...
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    • file locking python security toctou vulnerability
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    • Forum: Security Alerts

  9. Urgent: Fix urllib3 CVE-2025-66471 Streaming Decompression DoS

    A newly disclosed vulnerability in the widely used Python HTTP library urllib3 can let small, highly compressed responses force clients to decompress massive amounts of data — consuming CPU and memory and causing denial-of-service conditions for applications that stream HTTP responses. The...
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    • cve 2025 66471 python security streaming decompression urllib3 vulnerability
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    • Forum: Security Alerts

  10. Urgent Patch: urllib3 2.6.0 Fixes CVE-2025-66418 DoS

    A critical denial-of-service vulnerability has been disclosed in the ubiquitous Python HTTP client library urllib3 that allows a remote server to trigger excessive CPU and memory consumption by specifying an unbounded chain of content encodings in an HTTP response; the flaw affects urllib3...
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    • dos vulnerability encoding python security urllib3
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  11. CVE-2025-12084: CPython minidom XML DoS Fix and Patch Guidance

    A subtle but consequential performance flaw in CPython’s xml.dom.minidom has been assigned CVE‑2025‑12084 after maintainers confirmed a quadratic‑time behavior in the node ID cache clearing routine that can be triggered when constructing deeply nested XML documents; the defect has been fixed...

  12. CVE-2025-13836 Python http.client Read DoS and OOM via Content-Length

    A newly recorded weakness in Python’s standard HTTP client lets a malicious server force a client process to allocate huge amounts of memory by abusing the Content-Length handling, creating a remote Denial‑of‑Service (DoS) and out‑of‑memory (OOM) risk for applications that use the library...
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    • cve 2025 13836 httpclient memory safety python security
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    • Forum: Security Alerts