CVE-2023-26485

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Source

https://nvd.nist.gov/vuln/detail/CVE-2023-26485

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-26485.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2023-26485

Related

GHSA-r8vr-c48j-fcc5
UBUNTU-CVE-2023-26485
USN-7319-1

Published

2023-03-31T23:15:07Z

Modified

2025-05-03T04:54:40.430522Z

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

Summary

[none]

Details

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service. This CVE covers quadratic complexity issues when parsing text which leads with either large numbers of _ characters. This issue has been addressed in version 0.29.0.gfm.10. Users are advised to upgrade. Users unable to upgrade should validate that their input comes from trusted sources.

Impact

A polynomial time complexity issue in cmark-gfm may lead to unbounded resource exhaustion and subsequent denial of service.

Proof of concept

$ ~/cmark-gfm$ python3 -c 'pad = "_" * 100000; print(pad + "." + pad, end="")' | time ./build/src/cmark-gfm --to plaintext

Increasing the number 10000 in the above commands causes the running time to increase quadratically.

Patches

This vulnerability have been patched in 0.29.0.gfm.10.

Note on cmark and cmark-gfm

XXX: TBD

cmark-gfm is a fork of cmark that adds the GitHub Flavored Markdown extensions. The two codebases have diverged over time, but share a common core. These bugs affect both cmark and cmark-gfm.

Credit

We would like to thank @gravypod for reporting this vulnerability.

References

https://en.wikipedia.org/wiki/Time_complexity

For more information

If you have any questions or comments about this advisory:

Open an issue in github/cmark-gfm

References

Affected packages

Debian:11 / cmark-gfm

Package

Name: cmark-gfm
Purl: pkg:deb/debian/cmark-gfm?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.29.0.gfm.0-6

0.29.0.gfm.2-1

0.29.0.gfm.2-2

0.29.0.gfm.3-3

0.29.0.gfm.6-2

0.29.0.gfm.6-2.1

0.29.0.gfm.6-3

0.29.0.gfm.6-4

0.29.0.gfm.6-5

0.29.0.gfm.6-6

0.29.0.gfm.13-1

0.29.0.gfm.13-2

0.29.0.gfm.13-3

0.29.0.gfm.13-4

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / cmark-gfm

Package

Name: cmark-gfm
Purl: pkg:deb/debian/cmark-gfm?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.29.0.gfm.6-6

0.29.0.gfm.13-1

0.29.0.gfm.13-2

0.29.0.gfm.13-3

0.29.0.gfm.13-4

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / cmark-gfm

Package

Name: cmark-gfm
Purl: pkg:deb/debian/cmark-gfm?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.29.0.gfm.13-1

Affected versions

0.*

0.29.0.gfm.6-6

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:11 / python-cmarkgfm

Package

Name: python-cmarkgfm
Purl: pkg:deb/debian/python-cmarkgfm?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.4.2-1

0.7.0-1

0.8.0-1

0.8.0-2

0.8.0-3

2024.*

2024.11.20-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / python-cmarkgfm

Package

Name: python-cmarkgfm
Purl: pkg:deb/debian/python-cmarkgfm?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.8.0-3

2024.*

2024.11.20-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / python-cmarkgfm

Package

Name: python-cmarkgfm
Purl: pkg:deb/debian/python-cmarkgfm?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2024.11.20-1

Affected versions

0.*

0.8.0-3

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:11 / r-cran-commonmark

Package

Name: r-cran-commonmark
Purl: pkg:deb/debian/r-cran-commonmark?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.7-2

1.8.0-1

1.8.1-1

1.9.0-1

1.9.1-1

1.9.2-1

1.9.2-2

1.9.5-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / r-cran-commonmark

Package

Name: r-cran-commonmark
Purl: pkg:deb/debian/r-cran-commonmark?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.8.1-1

1.9.0-1

1.9.1-1

1.9.2-1

1.9.2-2

1.9.5-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / r-cran-commonmark

Package

Name: r-cran-commonmark
Purl: pkg:deb/debian/r-cran-commonmark?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.9.1-1

Affected versions

1.*

1.8.1-1

1.9.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:11 / ruby-commonmarker

Package

Name: ruby-commonmarker
Purl: pkg:deb/debian/ruby-commonmarker?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.21.0-1

0.21.0-2

0.21.0-3

0.23.2-1

0.23.2-2

0.23.4-1

0.23.6-1~bpo11+1

0.23.6-1

0.23.9-1

0.23.10-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / ruby-commonmarker

Package

Name: ruby-commonmarker
Purl: pkg:deb/debian/ruby-commonmarker?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

0.*

0.23.6-1

0.23.9-1

0.23.10-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / ruby-commonmarker

Package

Name: ruby-commonmarker
Purl: pkg:deb/debian/ruby-commonmarker?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.23.10-1

Affected versions

0.*

0.23.6-1

0.23.9-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Git / github.com/github/cmark-gfm

Affected ranges

Type: GIT
Repo: https://github.com/github/cmark-gfm
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

07a66c9bc341f902878e37d7da8647d6ef150987

Fixed

07a66c9bc341f902878e37d7da8647d6ef150987

Affected versions

0.*

0.27.1.gfm.2

0.27.1.gfm.3

0.27.1.gfm.4

0.28.0.gfm.10

0.28.0.gfm.11

0.28.0.gfm.5

0.28.0.gfm.6

0.28.0.gfm.7

0.28.0.gfm.8

0.28.0.gfm.9

0.28.3.gfm.12

0.28.3.gfm.13

0.28.3.gfm.14

0.28.3.gfm.15

0.28.3.gfm.16

0.28.3.gfm.17

0.28.3.gfm.18

0.28.3.gfm.19

0.28.3.gfm.20

0.29.0.gfm.0

0.29.0.gfm.1

0.29.0.gfm.2

0.29.0.gfm.3

0.29.0.gfm.4

0.29.0.gfm.5

0.29.0.gfm.6

0.29.0.gfm.7

0.29.0.gfm.8

0.29.0.gfm.9