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OESA-2026-2136 python-flask security update

🗓️ 03 May 2026 09:55:44Reported by GoogleType 
osv
 osv🔗 osv.dev👁 2 Views

Flask fixes a cache leakage by setting Vary: Cookie when the session is accessed; upgrade to version 3.1.3.

Related
Refs
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IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - IoT Component uses multiple third party dependencies which is vulnerable to multiple CVEs.
1 Apr 202607:22
–ibm
IBM Security Bulletins		Security Bulletin:Flask Vary Cookie Header Vulnerability: Use of Cache Containing Sensitive Information Fixed in 3.1.3
4 May 202612:50
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite uses flask-3.1.2-py3-none-any.whl which is vulnerable to CVE-2026-27205.
6 Apr 202618:34
–ibm
IBM Security Bulletins		Security Bulletin: Investigation Assistant App for IBM QRadar SIEM is vulnerable to using components with known vulnerabilities
6 Apr 202617:16
–ibm
IBM Security Bulletins		Security Bulletin: Location Service for ESRI Component uses cryptography-46.0.3, flask-3.1.2 and werkzeug-3.1.5 library which were vulnerable to CVE-2026-26007, CVE-2026-27205 and CVE-2026-27199 respectively
30 Mar 202615:08
–ibm
IBM Security Bulletins		Security Bulletin: IBM Watson Discovery Cartridge affected by vulnerability in flask-3.1.2-py3-none-any.whl
1 Jun 202617:08
–ibm
IBM Security Bulletins		Security Bulletin: Multiple security vulnerabilities are addressed with IBM Process Mining 2.1.1
31 Mar 202616:18
–ibm
IBM Security Bulletins		Security Bulletin: Maximo AI Service uses qs-6.14.1.tgz and flask-3.0.3-py3-none-any.whl which is vulnerable to CVE-2026-2391 and CVE-2026-27205.
6 Apr 202613:58
–ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Scheduler Optimizer uses flask-3.1.2-py3-none-any.whl which is vulnerable to CVE-2026-27205
7 May 202614:00
–ibm
IBM Security Bulletins		Security Bulletin: Vulnerability affect underscore-umd-min, werkzeug-3.1.5, flask-3.1.1, cryptography, aircompressor, pyasn1, http, log4j, apache2-build, commons-configuration, bcpkix-jdk18on, server-MariaDB, Jline, IBM COS Systems (April 2026)
26 May 202613:44
–ibm
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03 May 2026 10:17Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.14.3
CVSS 42.3
EPSS0.00014
SSVC
Flasksession cachevary cookie headerversion upgrade 3.1.3
2