CVE-2020-5238
MEDIUMGithub Flavored Markdown < 0.29.0.gfm.1 - Improper Input Validation
Title source: ruleDescription
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.
References (5)
Core 5
Core References
Third Party Advisory x_refsource_confirm
https://github.com/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85
Patch, Third Party Advisory x_refsource_misc
https://github.com/github/cmark-gfm/commit/85d895289c5ab67f988ca659493a64abb5fec7b4
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TCDHBTUFIOYRIS5HAS6PZNBNMB7IOAX3/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGJH2A4VAV54X6NSCNNGSEIGIIY5N2VR/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMQFOQQCWOAMQ4I2XIVCVOXXIJ75HDCW/
Scores
CVSS v3
6.5
EPSS
0.0051
EPSS Percentile
66.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-20
Status
published
Products (4)
fedoraproject/fedora
31
fedoraproject/fedora
32
fedoraproject/fedora
33
github_flavored_markdown_project/github_flavored_markdown
< 0.29.0.gfm.1
Published
Jul 01, 2020
Tracked Since
Feb 18, 2026