USN-8104-1

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Source
https://ubuntu.com/security/notices/USN-8104-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8104-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8104-1
Upstream
Related
Published
2026-03-18T03:18:47Z
Modified
2026-03-19T08:43:59.523116Z
Summary
flask vulnerability
Details

Shourya Jaiswal discovered that Flask did not correctly mark certain web responses as user-specific. A remote attacker could possibly use this issue to obtain sensitive information.

References

Affected packages

Ubuntu:Pro:20.04:LTS / flask

Package

Name
flask
Purl
pkg:deb/ubuntu/flask@1.1.1-2ubuntu0.1+esm1?arch=source&distro=esm-infra/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.1.1-2ubuntu0.1+esm1

Affected versions

1.*
1.0.2-3
1.1.1-2
1.1.1-2ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-flask",
            "binary_version": "1.1.1-2ubuntu0.1+esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8104-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-27205"
        }
    ]
}

Ubuntu:22.04:LTS / flask

Package

Name
flask
Purl
pkg:deb/ubuntu/flask@2.0.1-2ubuntu1.2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.0.1-2ubuntu1.2

Affected versions

1.*
1.1.2-2
2.*
2.0.1-2ubuntu1
2.0.1-2ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-flask",
            "binary_version": "2.0.1-2ubuntu1.2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8104-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:22.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-27205"
        }
    ]
}

Ubuntu:24.04:LTS / flask

Package

Name
flask
Purl
pkg:deb/ubuntu/flask@3.0.2-1ubuntu1.1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.0.2-1ubuntu1.1

Affected versions

2.*
2.2.5-1ubuntu1
3.*
3.0.2-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-flask",
            "binary_version": "3.0.2-1ubuntu1.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8104-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:24.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-27205"
        }
    ]
}