USN-8077-1

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Source
https://ubuntu.com/security/notices/USN-8077-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8077-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8077-1
Upstream
Related
Published
2026-03-05T16:04:13Z
Modified
2026-03-09T11:31:02.456603Z
Summary
python-bleach vulnerabilities
Details

It was discovered that Bleach did not properly sanitize URI attributes containing character entities. An attacker could possibly use this issue to construct a URI with a disallowed scheme that would bypass sanitization, leading to cross-site scripting. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-7753)

Yaniv Nizry discovered that Bleach was vulnerable to a mutation cross-site scripting issue when sanitizing HTML with the noscript tag and a raw tag in the allowed tags list. An attacker could possibly use this issue to inject malicious content, leading to cross-site scripting. This issue only affected Ubuntu 18.04 LTS. (CVE-2020-6802)

Yaniv Nizry discovered that Bleach was vulnerable to a mutation cross-site scripting issue when sanitizing HTML with RCDATA together with svg or math tags in the allowed tags list. An attacker could possibly use this issue to inject malicious content, leading to cross-site scripting. (CVE-2020-6816)

It was discovered that Bleach incorrectly handled parsing of style attributes when sanitizing HTML. An attacker could possibly use this issue to perform a regular expression denial of service, leading to excessive resource consumption. (CVE-2020-6817)

Yaniv Nizry and Michał Bentkowski discovered that Bleach was vulnerable to a mutation cross-site scripting issue when sanitizing HTML with certain combinations of allowed tags. An attacker could possibly use this issue to inject malicious content, leading to cross-site scripting. (CVE-2021-23980)

References

Affected packages

Ubuntu:Pro:16.04:LTS / python-bleach

Package

Name
python-bleach
Purl
pkg:deb/ubuntu/python-bleach@1.4.2-1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.4.2-1ubuntu0.1~esm1

Affected versions

1.*
1.4-1
1.4.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.4.2-1ubuntu0.1~esm1",
            "binary_name": "python-bleach"
        },
        {
            "binary_version": "1.4.2-1ubuntu0.1~esm1",
            "binary_name": "python3-bleach"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-6816"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-6817"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2021-23980"
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8077-1.json"

Ubuntu:Pro:18.04:LTS / python-bleach

Package

Name
python-bleach
Purl
pkg:deb/ubuntu/python-bleach@2.1.2-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.1.2-1ubuntu0.1~esm1

Affected versions

2.*
2.0-1
2.1.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.2-1ubuntu0.1~esm1",
            "binary_name": "python-bleach"
        },
        {
            "binary_version": "2.1.2-1ubuntu0.1~esm1",
            "binary_name": "python3-bleach"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2018-7753"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-6802"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-6816"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-6817"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2021-23980"
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8077-1.json"

Ubuntu:Pro:20.04:LTS / python-bleach

Package

Name
python-bleach
Purl
pkg:deb/ubuntu/python-bleach@3.1.1-1ubuntu0.1~esm1?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.1.1-1ubuntu0.1~esm1

Affected versions

3.*
3.1.0-1
3.1.0-2
3.1.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.1.1-1ubuntu0.1~esm1",
            "binary_name": "python3-bleach"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Database specific

cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-6816"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-6817"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2021-23980"
        }
    ]
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8077-1.json"