{"schema_version":1,"title":"flask (PyPI) vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 5 vulnerabilities in flask (PyPI): 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2025-47278, was published on 7 July 2026.","url":"https://junglewise.ai/threats/technologies/flask","json_url":"https://junglewise.ai/threats/technologies/flask.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/flask","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":0,"all_time":5,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":1,"last_365_days":2},"latest":[{"cve":"CVE-2025-47278","cvss":4,"epss":0.0018,"slug":"cve-2025-47278-flask-uses-fallback-key-instead-of-current-signing-key","title":"PYSEC-2026-1377 - Flask uses fallback key instead of current signing key","severity":"medium","exploited":false,"published_at":"2026-07-07T16:02:52.410162+00:00","url":"https://junglewise.ai/threats/cve-2025-47278-flask-uses-fallback-key-instead-of-current-signing-key"},{"cve":"CVE-2026-27205","cvss":4,"epss":0.0042,"slug":"cve-2026-27205-flask-session-does-not-add-vary-cookie-header-when-accessed-in","title":"PYSEC-2026-2151 - Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed","severity":"medium","exploited":false,"published_at":"2026-02-21T06:17:00.91+00:00","url":"https://junglewise.ai/threats/cve-2026-27205-flask-session-does-not-add-vary-cookie-header-when-accessed-in"},{"cve":"CVE-2023-30861","cvss":3.1,"epss":0.0126,"slug":"cve-2023-30861-flask-vulnerable-to-possible-disclosure-of-permanent-session","title":"PYSEC-2023-62 - Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for","severity":"low","exploited":false,"published_at":"2023-05-02T18:15:00+00:00","url":"https://junglewise.ai/threats/cve-2023-30861-flask-vulnerable-to-possible-disclosure-of-permanent-session"},{"cve":"CVE-2019-1010083","cvss":3.1,"epss":0.0188,"slug":"cve-2019-1010083-pallets-project-flask-is-vulnerable-to-denial-of-service-via","title":"PYSEC-2019-179 - The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of service. The attack vector is: crafte","severity":"low","exploited":false,"published_at":"2019-07-17T14:15:00+00:00","url":"https://junglewise.ai/threats/cve-2019-1010083-pallets-project-flask-is-vulnerable-to-denial-of-service-via"},{"cve":"CVE-2018-1000656","cvss":3.1,"epss":0.0386,"slug":"cve-2018-1000656-flask-is-vulnerable-to-denial-of-service-via-incorrect-encoding","title":"PYSEC-2018-66 - The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large","severity":"low","exploited":false,"published_at":"2018-08-20T19:31:00+00:00","url":"https://junglewise.ai/threats/cve-2018-1000656-flask-is-vulnerable-to-denial-of-service-via-incorrect-encoding"}],"weekly":[{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":1},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-28","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"tensorflow (PyPI)","slug":"pypi-tensorflow","vulnerabilities":428,"url":"https://junglewise.ai/threats/technologies/pypi-tensorflow"},{"name":"tensorflow-cpu (PyPI)","slug":"tensorflow-cpu","vulnerabilities":424,"url":"https://junglewise.ai/threats/technologies/tensorflow-cpu"},{"name":"tensorflow-gpu (PyPI)","slug":"tensorflow-gpu","vulnerabilities":421,"url":"https://junglewise.ai/threats/technologies/tensorflow-gpu"},{"name":"open-webui (PyPI)","slug":"open-webui","vulnerabilities":177,"url":"https://junglewise.ai/threats/technologies/open-webui"},{"name":"Django (PyPI)","slug":"django","vulnerabilities":172,"url":"https://junglewise.ai/threats/technologies/django"},{"name":"apache-airflow (PyPI)","slug":"apache-airflow","vulnerabilities":152,"url":"https://junglewise.ai/threats/technologies/apache-airflow"},{"name":"plone (PyPI)","slug":"pypi-plone","vulnerabilities":101,"url":"https://junglewise.ai/threats/technologies/pypi-plone"},{"name":"praisonai (PyPI)","slug":"pypi-praisonai","vulnerabilities":86,"url":"https://junglewise.ai/threats/technologies/pypi-praisonai"},{"name":"exiv2 (PyPI)","slug":"exiv2","vulnerabilities":85,"url":"https://junglewise.ai/threats/technologies/exiv2"},{"name":"nltk (PyPI)","slug":"nltk","vulnerabilities":83,"url":"https://junglewise.ai/threats/technologies/nltk"},{"name":"mlflow (PyPI)","slug":"mlflow","vulnerabilities":82,"url":"https://junglewise.ai/threats/technologies/mlflow"},{"name":"pillow (PyPI)","slug":"pillow","vulnerabilities":79,"url":"https://junglewise.ai/threats/technologies/pillow"}],"technology":{"hub":true,"name":"flask (PyPI)","slug":"flask","vendor":{"name":"PyPI","slug":"pypi","url":"https://junglewise.ai/threats/vendors/pypi"},"aliases":[],"description":"Python web framework for building web applications and APIs.","url":"https://junglewise.ai/threats/technologies/flask"},"most_severe":[{"cve":"CVE-2026-27205","cvss":4,"epss":0.0042,"slug":"cve-2026-27205-flask-session-does-not-add-vary-cookie-header-when-accessed-in","title":"PYSEC-2026-2151 - Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed","severity":"medium","exploited":false,"published_at":"2026-02-21T06:17:00.91+00:00","url":"https://junglewise.ai/threats/cve-2026-27205-flask-session-does-not-add-vary-cookie-header-when-accessed-in"},{"cve":"CVE-2025-47278","cvss":4,"epss":0.0018,"slug":"cve-2025-47278-flask-uses-fallback-key-instead-of-current-signing-key","title":"PYSEC-2026-1377 - Flask uses fallback key instead of current signing key","severity":"medium","exploited":false,"published_at":"2026-07-07T16:02:52.410162+00:00","url":"https://junglewise.ai/threats/cve-2025-47278-flask-uses-fallback-key-instead-of-current-signing-key"},{"cve":"CVE-2018-1000656","cvss":3.1,"epss":0.0386,"slug":"cve-2018-1000656-flask-is-vulnerable-to-denial-of-service-via-incorrect-encoding","title":"PYSEC-2018-66 - The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large","severity":"low","exploited":false,"published_at":"2018-08-20T19:31:00+00:00","url":"https://junglewise.ai/threats/cve-2018-1000656-flask-is-vulnerable-to-denial-of-service-via-incorrect-encoding"},{"cve":"CVE-2019-1010083","cvss":3.1,"epss":0.0188,"slug":"cve-2019-1010083-pallets-project-flask-is-vulnerable-to-denial-of-service-via","title":"PYSEC-2019-179 - The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of service. The attack vector is: crafte","severity":"low","exploited":false,"published_at":"2019-07-17T14:15:00+00:00","url":"https://junglewise.ai/threats/cve-2019-1010083-pallets-project-flask-is-vulnerable-to-denial-of-service-via"},{"cve":"CVE-2023-30861","cvss":3.1,"epss":0.0126,"slug":"cve-2023-30861-flask-vulnerable-to-possible-disclosure-of-permanent-session","title":"PYSEC-2023-62 - Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for","severity":"low","exploited":false,"published_at":"2023-05-02T18:15:00+00:00","url":"https://junglewise.ai/threats/cve-2023-30861-flask-vulnerable-to-possible-disclosure-of-permanent-session"}],"generated_at":"2026-09-28T03:07:00.154823+00:00"}