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Python CVE-2026-27205

MEDIUM
Use of Cache Containing Sensitive Information (CWE-524)
2026-02-21 security-advisories@github.com GHSA-68rp-wp8r-4726
Python Flask Red Hat Suse
4.3
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
SUSE
MEDIUM
qualitative
Red Hat
4.3 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 22:04 vuln.today
Patch released
Feb 24, 2026 - 21:59 nvd
Patch available
CVE Published
Feb 21, 2026 - 06:17 nvd
MEDIUM 4.3

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 12,436 pypi packages depend on flask (7,909 direct, 4,715 indirect)

Ecosystem-wide dependent count for version 3.1.3.

DescriptionGitHub Advisory

Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed, Flask should set the Vary: Cookie header., resulting in a Use of Cache Containing Sensitive Information vulnerability. The logic instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python in operator were overlooked. The severity and risk depend on the application being hosted behind a caching proxy that doesn't ignore responses with cookies, not setting a Cache-Control header to mark pages as private or non-cacheable, and accessing the session in a way that only touches keys without reading values or mutating the session. The issue has been fixed in version 3.1.3.

AnalysisAI

Flask versions 3.1.2 and earlier fail to set proper cache headers when the session object is accessed through certain methods like the Python in operator, allowing cached responses containing user-specific session data to be served to other users. An attacker can exploit this to access sensitive information from cached responses if the application runs behind a caching proxy that doesn't ignore Set-Cookie headers. This requires the vulnerable application to lack explicit Cache-Control headers and access session data in ways that bypass normal cache-control logic.

Technical ContextAI

Affects Flask. Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed, Flask should set the Vary: Cookie header., resulting in a Use of Cache Containing Sensitive Information vulnerability. The logic instructs caches not to cache the response, as it may contain information specific to a logged in user. This is handled in most cases, but some forms of access such as the Python in operator were overlooked. The severity and risk d

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 3.1.3.. Restrict network access to the affected service where possible.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Python 3 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
openSUSE Leap 15.6 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 12 Fixed

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CVE-2026-27205 vulnerability details – vuln.today
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