UBUNTU-CVE-2021-44686

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Source
https://ubuntu.com/security/CVE-2021-44686
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44686.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-44686
Upstream
Published
2021-12-07T00:15:00Z
Modified
2025-09-08T16:47:25Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

calibre before 5.32.0 contains a regular expression that is vulnerable to ReDoS (Regular Expression Denial of Service) in htmlpreprocessrules in ebooks/conversion/preprocess.py.

References

Affected packages

Ubuntu:Pro:16.04:LTS / calibre

Package

Name
calibre
Purl
pkg:deb/ubuntu/calibre@2.55.0+dfsg-1ubuntu0.2?arch=source&distro=esm-apps/xenial

Affected ranges

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

Affected versions

2.*

2.33.0+dfsg-1build1
2.38.0+dfsg-1
2.45.0+dfsg-1
2.45.0+dfsg-1build1
2.48.0+dfsg-1
2.48.0+dfsg-1build1
2.54.0+dfsg-1
2.55.0+dfsg-1
2.55.0+dfsg-1ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "calibre",
            "binary_version": "2.55.0+dfsg-1ubuntu0.2"
        },
        {
            "binary_name": "calibre-bin",
            "binary_version": "2.55.0+dfsg-1ubuntu0.2"
        }
    ]
}

Ubuntu:Pro:18.04:LTS / calibre

Package

Name
calibre
Purl
pkg:deb/ubuntu/calibre@3.21.0+dfsg-1build1?arch=source&distro=esm-apps/bionic

Affected ranges

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

Affected versions

3.*

3.7.0+dfsg-2
3.7.0+dfsg-2build1
3.12.0+dfsg-1
3.13.0+dfsg-1
3.14.0+dfsg-1
3.15.0.1+dfsg-1
3.16.0+dfsg-1
3.16.0+dfsg-1build1
3.17.0+dfsg-1
3.17.0+dfsg-2
3.18.0+dfsg-1build1
3.19.0+dfsg-1
3.20.0+dfsg-1
3.21.0+dfsg-1
3.21.0+dfsg-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "calibre",
            "binary_version": "3.21.0+dfsg-1build1"
        },
        {
            "binary_name": "calibre-bin",
            "binary_version": "3.21.0+dfsg-1build1"
        }
    ]
}

Ubuntu:Pro:20.04:LTS / calibre

Package

Name
calibre
Purl
pkg:deb/ubuntu/calibre@4.99.4+dfsg+really4.12.0-1ubuntu1?arch=source&distro=esm-apps/focal

Affected ranges

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

Affected versions

3.*

3.46.0+dfsg-1

4.*

4.2.0+dfsg-2
4.3.0+dfsg-1
4.3.0+dfsg-2
4.4.0+dfsg-1
4.5.0+dfsg-1
4.5.0+dfsg-2
4.5.0+dfsg-3
4.6.0+dfsg-1
4.7.0+dfsg-1
4.99.3+dfsg-2
4.99.4+dfsg-1
4.99.4+dfsg-1build1
4.99.4+dfsg+really4.10.0+py3-2
4.99.4+dfsg+really4.11.2-1
4.99.4+dfsg+really4.11.2-1build1
4.99.4+dfsg+really4.12.0-1
4.99.4+dfsg+really4.12.0-1build1
4.99.4+dfsg+really4.12.0-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "calibre",
            "binary_version": "4.99.4+dfsg+really4.12.0-1ubuntu1"
        },
        {
            "binary_name": "calibre-bin",
            "binary_version": "4.99.4+dfsg+really4.12.0-1ubuntu1"
        }
    ]
}

Ubuntu:22.04:LTS / calibre

Package

Name
calibre
Purl
pkg:deb/ubuntu/calibre@5.37.0+dfsg-1build1?arch=source&distro=jammy

Affected ranges

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

Affected versions

5.*

5.25.0+dfsg-2
5.33.2+dfsg-1
5.34.0+dfsg-1
5.35.0+dfsg-1ubuntu2
5.37.0+dfsg-1
5.37.0+dfsg-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "calibre",
            "binary_version": "5.37.0+dfsg-1build1"
        },
        {
            "binary_name": "calibre-bin",
            "binary_version": "5.37.0+dfsg-1build1"
        }
    ]
}