UBUNTU-CVE-2021-26271

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Source
https://ubuntu.com/security/CVE-2021-26271
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26271.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-26271
Upstream
Published
2021-01-26T21:15:00Z
Modified
2025-09-08T16:47:00Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).

References

Affected packages

Ubuntu:Pro:16.04:LTS / ckeditor

Package

Name
ckeditor
Purl
pkg:deb/ubuntu/ckeditor@4.5.7+dfsg-2ubuntu0.16.04.1~esm2?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.4.4+dfsg1-3
4.5.6+dfsg-1
4.5.7+dfsg-1
4.5.7+dfsg-2
4.5.7+dfsg-2ubuntu0.16.04.1~esm1
4.5.7+dfsg-2ubuntu0.16.04.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.5.7+dfsg-2ubuntu0.16.04.1~esm2",
            "binary_name": "ckeditor"
        }
    ]
}

Ubuntu:Pro:18.04:LTS / ckeditor

Package

Name
ckeditor
Purl
pkg:deb/ubuntu/ckeditor@4.5.7+dfsg-2ubuntu0.18.04.1+esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.5.7+dfsg-2
4.5.7+dfsg-2ubuntu0.18.04.1
4.5.7+dfsg-2ubuntu0.18.04.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.5.7+dfsg-2ubuntu0.18.04.1+esm1",
            "binary_name": "ckeditor"
        }
    ]
}

Ubuntu:Pro:20.04:LTS / ckeditor

Package

Name
ckeditor
Purl
pkg:deb/ubuntu/ckeditor@4.12.1+dfsg-1ubuntu0.1+esm1?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.11.1+dfsg-1
4.12.1+dfsg-1
4.12.1+dfsg-1ubuntu0.1
4.12.1+dfsg-1ubuntu0.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.12.1+dfsg-1ubuntu0.1+esm1",
            "binary_name": "ckeditor"
        }
    ]
}