{"answers":{"affected":"3 open source packages ship an affected version, including werkzeug and Werkzeug. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-21860 in the wild and no public exploit code.","fix":"Upgrade werkzeug to 3.1.5 or later.","what":"CVE-2026-21860 is a medium-severity path traversal vulnerability in pallets werkzeug, published on 8 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-21860 and fix it if it is affected.\n\nWhat it is: CVE-2026-21860 is a medium-severity path traversal vulnerability in pallets werkzeug, published on 8 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-21860 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- werkzeug (PyPI): affected all versions; fixed in 3.1.5\n- werkzeug (PyPI): affected all versions; fixed in 3.1.5\n- Werkzeug (PyPI): affected all versions; fixed in 3.1.5\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-21860/ (Markdown: https://insights.sbomify.com/CVE-2026-21860/index.md)","id":"CVE-2026-21860","markdown":"https://insights.sbomify.com/CVE-2026-21860/index.md","name":"CVE-2026-21860","record":{"aliases":["ALPINE-CVE-2026-21860","CLEANSTART-2026-FD77375","CLEANSTART-2026-TQ31393","ECHO-f6ae-4560-1e3c","GHSA-87hc-h4r5-73f7","MINI-g7f9-qvxm-mrqc","MINI-v45h-whv3-h7pj","PYSEC-2026-2044","ROOT-APP-PYPI-CVE-2026-21860"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Python web library","requires_auth":"none","summary":"Werkzeug's safe_join function fails to block Windows special device names with extensions, allowing attackers to read sensitive system files on Windows servers.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"werkzeug","vendor":"palletsprojects"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-67","name":"Improper Handling of Windows Device Names"}],"description":"Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.5, Werkzeug's safe_join function allows path segments with Windows device names that have file extensions or trailing spaces. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. Windows still accepts them with any file extension, such as CON.txt, or trailing spaces such as CON. This issue has been patched in version 3.1.5.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Werkzeug safe_join() allows Windows special device names with compound extensions","id":"CVE-2026-21860","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)","id":"CVE-2026-21861"},"packages":[{"ecosystem":"PyPI","fixed":["3.1.5"],"introduced":["0"],"last_affected":[],"package":"Werkzeug","purl":null,"source":"GHSA-87hc-h4r5-73f7"},{"ecosystem":"PyPI","fixed":["3.1.5"],"introduced":["0"],"last_affected":[],"package":"werkzeug","purl":"pkg:pypi/werkzeug","source":"GHSA-87hc-h4r5-73f7"},{"ecosystem":"PyPI","fixed":["3.1.5"],"introduced":["0"],"last_affected":[],"package":"werkzeug","purl":"pkg:pypi/werkzeug","source":"PYSEC-2026-2044"}],"prev":{"headline":"Mailpit Proxy Endpoint is Vulnerable to Server-Side Request Forgery (SSRF)","id":"CVE-2026-21859"},"products":["werkzeug"],"published":"2026-01-08","related":[{"cvss_score":9.8,"headline":"Other in n/a","id":"CVE-2022-29361","kev_date_added":null,"published":"2022-05-24"},{"cvss_score":8,"headline":"Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning","id":"CVE-2023-46136","kev_date_added":null,"published":"2023-10-24"},{"cvss_score":7.5,"headline":"Werkzeug may allow high resource usage when parsing multipart form data with many fields","id":"CVE-2023-25577","kev_date_added":null,"published":"2023-02-14"},{"cvss_score":7.5,"headline":"Pallets Werkzeug vulnerable to Path Traversal","id":"CVE-2019-14322","kev_date_added":null,"published":"2019-07-28"},{"cvss_score":6.3,"headline":"Werkzeug safe_join() allows Windows special device names","id":"CVE-2026-27199","kev_date_added":null,"published":"2026-02-21"},{"cvss_score":6.3,"headline":"Werkzeug safe_join() allows Windows special device names","id":"CVE-2025-66221","kev_date_added":null,"published":"2025-11-29"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-08","vendors":["pallets"]},"summary":"Werkzeug's safe_join function fails to block Windows special device names with extensions, allowing attackers to read sensitive system files on Windows servers.","url":"https://insights.sbomify.com/CVE-2026-21860/"}