CVE catalog

CVE-2020-5238

cmark-gfm: CVE-2020-5238

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Jul 1, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.57% · Oct 25, 2026

The table extension in GitHub Flavored Markdown before version 0.29.0.gfm.1 takes O(n * n) time to parse certain inputs. An attacker could craft a markdown table which would take an unreasonably long time to process, causing a denial of service. This issue does not affect the upstream cmark project. The issue has been fixed in version 0.29.0.gfm.1.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	cmark-gfm	sid	`0.29.0.gfm.13-7.1`	fixed
Debian	cmark-gfm	forky	`0.29.0.gfm.13-7.1`	fixed
Debian	cmark-gfm	trixie	`0.29.0.gfm.13-4`	fixed
Debian	cmark-gfm	bookworm	`0.29.0.gfm.6-6`	fixed
Debian	python-cmarkgfm	sid	`2025.10.22-2`	fixed
Debian	python-cmarkgfm	forky	`2025.10.22-2`	fixed
Debian	python-cmarkgfm	trixie	`2024.11.20-1`	fixed
Debian	python-cmarkgfm	bookworm	`0.8.0-3`	fixed
Debian	haskell-cmark-gfm	sid	`0.2.6+ds1-3`	fixed
Debian	haskell-cmark-gfm	forky	`0.2.6+ds1-3`	fixed
Debian	haskell-cmark-gfm	trixie	`0.2.6+ds1-1`	fixed
Debian	haskell-cmark-gfm	bookworm	`0.2.5+ds1-1`	fixed
Debian	r-cran-commonmark	sid	`2.0.0-3`	fixed
Debian	r-cran-commonmark	forky	`2.0.0-3`	fixed
Debian	r-cran-commonmark	trixie	`1.9.5-1`	fixed
Debian	r-cran-commonmark	bookworm	`1.8.1-1`	fixed
Debian	ruby-commonmarker	sid	`2.10.1-1`	fixed
Debian	ruby-commonmarker	forky	`2.10.0-2`	fixed
Debian	ruby-commonmarker	trixie	`0.23.10-1`	fixed
Debian	ruby-commonmarker	bookworm	`0.23.6-1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	cmark-gfm	source	sid	`0.29.0.gfm.2-1`	not yet assigned	Not reported	[965984]
Debian	cmark-gfm	source	forky	`0.29.0.gfm.2-1`	not yet assigned	Not reported	[965984]
Debian	cmark-gfm	source	trixie	`0.29.0.gfm.2-1`	not yet assigned	Not reported	[965984]
Debian	cmark-gfm	source	bookworm	`0.29.0.gfm.2-1`	not yet assigned	Not reported	[965984]
Debian	python-cmarkgfm	source	sid	`0.7.0-1`	not yet assigned	Not reported	[965983]
Debian	python-cmarkgfm	source	forky	`0.7.0-1`	not yet assigned	Not reported	[965983]
Debian	python-cmarkgfm	source	trixie	`0.7.0-1`	not yet assigned	Not reported	[965983]
Debian	python-cmarkgfm	source	bookworm	`0.7.0-1`	not yet assigned	Not reported	[965983]
Debian	haskell-cmark-gfm	source	sid	`0.2.1+ds1-1`	not yet assigned	Not reported	[965982]
Debian	haskell-cmark-gfm	source	forky	`0.2.1+ds1-1`	not yet assigned	Not reported	[965982]
Debian	haskell-cmark-gfm	source	trixie	`0.2.1+ds1-1`	not yet assigned	Not reported	[965982]
Debian	haskell-cmark-gfm	source	bookworm	`0.2.1+ds1-1`	not yet assigned	Not reported	[965982]
Debian	r-cran-commonmark	source	sid	`1.8.0-1`	not yet assigned	Not reported	[965980]
Debian	r-cran-commonmark	source	forky	`1.8.0-1`	not yet assigned	Not reported	[965980]
Debian	r-cran-commonmark	source	trixie	`1.8.0-1`	not yet assigned	Not reported	[965980]
Debian	r-cran-commonmark	source	bookworm	`1.8.0-1`	not yet assigned	Not reported	[965980]
Debian	ruby-commonmarker	source	sid	`0.21.0-1`	not yet assigned	Not reported	[965981]
Debian	ruby-commonmarker	source	forky	`0.21.0-1`	not yet assigned	Not reported	[965981]
Debian	ruby-commonmarker	source	trixie	`0.21.0-1`	not yet assigned	Not reported	[965981]
Debian	ruby-commonmarker	source	bookworm	`0.21.0-1`	not yet assigned	Not reported	[965981]

[Debian bug #965984][Debian bug #965983][Debian bug #965982][Debian bug #965980][Debian bug #965981]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[cmark-gfm]Fixed
Details (2)
- 0.29.0.gfm.6-6 · amd64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
- 0.29.0.gfm.6-6 · arm64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
[libcmark-gfm0.29.0.gfm.6]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.6-6 · amd64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
- 0.29.0.gfm.6-6 · arm64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
[libcmark-gfm-dev]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.6-6 · amd64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
- 0.29.0.gfm.6-6 · arm64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
[libcmark-gfm-extensions0.29.0.gfm.6]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.6-6 · amd64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
- 0.29.0.gfm.6-6 · arm64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
[libcmark-gfm-extensions-dev]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.6-6 · amd64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
- 0.29.0.gfm.6-6 · arm64 · bookworm
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · bookworm; dsa · cmark-gfm · debian · 12
[libghc-cmark-gfm-dev]Fixed
Source package: [haskell-cmark-gfm]
Details (2)
- 0.2.5+ds1-1+b1 · amd64 · bookworm
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · bookworm; dsa · haskell-cmark-gfm · debian · 12
- 0.2.5+ds1-1+b1 · arm64 · bookworm
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · bookworm; dsa · haskell-cmark-gfm · debian · 12
[libghc-cmark-gfm-doc]Fixed
Source package: [haskell-cmark-gfm]
Details (2)
- 0.2.5+ds1-1 · all · bookworm
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · bookworm; dsa · haskell-cmark-gfm · debian · 12
- 0.2.5+ds1-1 · all · bookworm
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · bookworm; dsa · haskell-cmark-gfm · debian · 12
[libghc-cmark-gfm-prof]Fixed
Source package: [haskell-cmark-gfm]
Details (2)
- 0.2.5+ds1-1+b1 · amd64 · bookworm
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · bookworm; dsa · haskell-cmark-gfm · debian · 12
- 0.2.5+ds1-1+b1 · arm64 · bookworm
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · bookworm; dsa · haskell-cmark-gfm · debian · 12
[python3-cmarkgfm]Fixed
Source package: [python-cmarkgfm]
Details (2)
- 0.8.0-3 · amd64 · bookworm
  Fixed · Fixed: 0.7.0-1
  dsa · python-cmarkgfm · debian · bookworm; dsa · python-cmarkgfm · debian · 12
- 0.8.0-3 · arm64 · bookworm
  Fixed · Fixed: 0.7.0-1
  dsa · python-cmarkgfm · debian · bookworm; dsa · python-cmarkgfm · debian · 12
[r-cran-commonmark]Fixed
Details (2)
- 1.8.1-1 · amd64 · bookworm
  Fixed · Fixed: 1.8.0-1
  dsa · r-cran-commonmark · debian · bookworm; dsa · r-cran-commonmark · debian · 12
- 1.8.1-1 · arm64 · bookworm
  Fixed · Fixed: 1.8.0-1
  dsa · r-cran-commonmark · debian · bookworm; dsa · r-cran-commonmark · debian · 12
[ruby-commonmarker]Fixed
Source package: [ruby-commonmarker]
Details (2)
- 0.23.6-1+b1 · amd64 · bookworm
  Fixed · Fixed: 0.21.0-1
  dsa · ruby-commonmarker · debian · bookworm; dsa · ruby-commonmarker · debian · 12
- 0.23.6-1+b1 · arm64 · bookworm
  Fixed · Fixed: 0.21.0-1
  dsa · ruby-commonmarker · debian · bookworm; dsa · ruby-commonmarker · debian · 12

[Debian 13 (Trixie)]

[cmark-gfm]Fixed
Details (2)
- 0.29.0.gfm.13-4 · amd64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
- 0.29.0.gfm.13-4 · arm64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
[libcmark-gfm0.29.0.gfm.13]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.13-4 · amd64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
- 0.29.0.gfm.13-4 · arm64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
[libcmark-gfm-dev]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.13-4 · amd64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
- 0.29.0.gfm.13-4 · arm64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
[libcmark-gfm-extensions0.29.0.gfm.13]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.13-4 · amd64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
- 0.29.0.gfm.13-4 · arm64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
[libcmark-gfm-extensions-dev]Fixed
Source package: [cmark-gfm]
Details (2)
- 0.29.0.gfm.13-4 · amd64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
- 0.29.0.gfm.13-4 · arm64 · trixie
  Fixed · Fixed: 0.29.0.gfm.2-1
  dsa · cmark-gfm · debian · 13
[libghc-cmark-gfm-dev]Fixed
Source package: [haskell-cmark-gfm]
Details (2)
- 0.2.6+ds1-1 · amd64 · trixie
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · 13
- 0.2.6+ds1-1 · arm64 · trixie
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · 13
[libghc-cmark-gfm-doc]Fixed
Source package: [haskell-cmark-gfm]
Details (2)
- 0.2.6+ds1-1 · all · trixie
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · 13
- 0.2.6+ds1-1 · all · trixie
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · 13
[libghc-cmark-gfm-prof]Fixed
Source package: [haskell-cmark-gfm]
Details (2)
- 0.2.6+ds1-1 · amd64 · trixie
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · 13
- 0.2.6+ds1-1 · arm64 · trixie
  Fixed · Fixed: 0.2.1+ds1-1
  dsa · haskell-cmark-gfm · debian · 13
[python3-cmarkgfm]Fixed
Source package: [python-cmarkgfm]
Details (2)
- 2024.11.20-1 · amd64 · trixie
  Fixed · Fixed: 0.7.0-1
  dsa · python-cmarkgfm · debian · 13
- 2024.11.20-1 · arm64 · trixie
  Fixed · Fixed: 0.7.0-1
  dsa · python-cmarkgfm · debian · 13

Next results

Observed: Oct 23, 2026, 5:52:50 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]