{
	"document":{
		"aggregate_severity":{
			"namespace":"https://nvd.nist.gov/vuln-metrics/cvss",
			"text":"Low"
		},
		"category":"csaf_vex",
		"csaf_version":"2.0",
		"distribution":{
			"tlp":{
				"label":"WHITE",
				"url":"https:/www.first.org/tlp/"
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		"lang":"en",
		"notes":[
			{
				"text":"python-flask security update",
				"category":"general",
				"title":"Synopsis"
			},
			{
				"text":"An update for python-flask is now available for openEuler-24.03-LTS-SP3",
				"category":"general",
				"title":"Summary"
			},
			{
				"text":"Flask is a lightweight WSGI web application framework. It is designed to make getting started quick and easy, with the ability to scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja and has become one of the most popular Python web application frameworks.\n\nSecurity Fix(es):\n\nFlask 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.(CVE-2026-27205)",
				"category":"general",
				"title":"Description"
			},
			{
				"text":"An update for python-flask is now available for master/openEuler-20.03-LTS-SP4/openEuler-22.03-LTS-SP4/openEuler-24.03-LTS/openEuler-24.03-LTS-Next/openEuler-24.03-LTS-SP1/openEuler-24.03-LTS-SP2/openEuler-24.03-LTS-SP3/openEuler-24.03-LTS-SP4.\n\nopenEuler Security has rated this update as having a security impact of low. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section.",
				"category":"general",
				"title":"Topic"
			},
			{
				"text":"Low",
				"category":"general",
				"title":"Severity"
			},
			{
				"text":"python-flask",
				"category":"general",
				"title":"Affected Component"
			}
		],
		"publisher":{
			"issuing_authority":"openEuler security committee",
			"name":"openEuler",
			"namespace":"https://www.openeuler.org",
			"contact_details":"openeuler-security@openeuler.org",
			"category":"vendor"
		},
		"references":[
			{
				"summary":"openEuler-SA-2026-2135",
				"category":"self",
				"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2135"
			},
			{
				"summary":"CVE-2026-27205",
				"category":"self",
				"url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-27205&packageName=python-flask"
			},
			{
				"summary":"nvd cve",
				"category":"external",
				"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27205"
			},
			{
				"summary":"openEuler-SA-2026-2135 vex file",
				"category":"self",
				"url":"https://repo.openeuler.org/security/data/csaf/advisories/2026/csaf-openeuler-sa-2026-2135.json"
			}
		],
		"title":"An update for python-flask is now available for openEuler-24.03-LTS-SP3",
		"tracking":{
			"initial_release_date":"2026-05-03T18:08:14+08:00",
			"revision_history":[
				{
					"date":"2026-05-03T18:08:14+08:00",
					"summary":"Initial",
					"number":"1.0.0"
				}
			],
			"generator":{
				"date":"2026-05-03T18:08:14+08:00",
				"engine":{
					"name":"openEuler CSAF Tool V1.0"
				}
			},
			"current_release_date":"2026-05-03T18:08:14+08:00",
			"id":"openEuler-SA-2026-2135",
			"version":"1.0.0",
			"status":"final"
		}
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				"name":"openEuler",
				"category":"vendor",
				"branches":[
					{
						"name":"openEuler",
						"branches":[
							{
								"product":{
									"product_identification_helper":{
										"cpe":"cpe:/a:openEuler:openEuler:24.03-LTS-SP3"
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									"product_id":"openEuler-24.03-LTS-SP3",
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								"category":"product_version"
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						"category":"product_name"
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					{
						"name":"noarch",
						"branches":[
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									"product_id":"python3-flask-2.2.5-2.oe2403sp3.noarch.rpm",
									"name":"python3-flask-2.2.5-2.oe2403sp3.noarch.rpm"
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								"name":"python3-flask-2.2.5-2.oe2403sp3.noarch.rpm",
								"category":"product_version"
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						"category":"architecture"
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					{
						"name":"src",
						"branches":[
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			{
				"relates_to_product_reference":"openEuler-24.03-LTS-SP3",
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				"full_product_name":{
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	"vulnerabilities":[
		{
			"cve":"CVE-2026-27205",
			"notes":[
				{
					"text":"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.",
					"category":"description",
					"title":"Vulnerability Description"
				}
			],
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					"openEuler-24.03-LTS-SP3:python-flask-2.2.5-2.oe2403sp3.src"
				]
			},
			"remediations":[
				{
					"product_ids":{"$ref":"$.vulnerabilities[0].product_status.fixed"},
					"details":"python-flask security update",
					"category":"vendor_fix",
					"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2135"
				}
			],
			"scores":[
				{
					"cvss_v3":{
						"baseSeverity":"LOW",
						"baseScore":2.3,
						"vectorString":"CVSS:3.1/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
						"version":"3.1"
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					"products":{"$ref":"$.vulnerabilities[0].product_status.fixed"}
				}
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			"threats":[
				{
					"details":"Low",
					"category":"impact"
				}
			],
			"title":"CVE-2026-27205"
		}
	]
}