PYSEC-2026-1377 Flask uses fallback key instead of current signing key

In Flask 3.1.0, the way fallback key configuration was handled resulted in the last fallback key being used for signing, rather than the current signing key. Signing is provided by the itsdangerous library. A list of keys can be passed, and it expects the last top key in the list to be the most...

Function Call With Incorrect Order of Arguments

Overview Affected versions of this package are vulnerable to Function Call With Incorrect Order of Arguments due to the incorrect handling of the SECRETKEYFALLBACKS configuration. An attacker can exploit this to sign sessions with stale keys, potentially impeding the transition to fresher keys...

GHSA-4GRG-W6V8-C28G Flask uses fallback key instead of current signing key

In Flask 3.1.0, the way fallback key configuration was handled resulted in the last fallback key being used for signing, rather than the current signing key. Signing is provided by the itsdangerous library. A list of keys can be passed, and it expects the last top key in the list to be the most...

AZL-77831 CVE-2025-47278 affecting package python-flask 1.1.1-4

Flask is a web server gateway interface WSGI web application framework. In Flask 3.1.0, the way fallback key configuration was handled resulted in the last fallback key being used for signing, rather than the current signing key. Signing is provided by the itsdangerous library. A list of keys can...