Improper input validation in Github Cmark-Gfm
CVE-2020-5238
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.016 (72.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Github Cmark-gfm — versions < 0.29.0.gfm.1
- Github_flavored_markdown_project Github_flavored_markdown
- Fedoraproject Fedora — versions 31, 32, 33
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2020-5238?
- CVE-2020-5238 is a medium-severity vulnerability in Github Cmark-Gfm, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2020-07-01.
- How severe is CVE-2020-5238?
- Medium severity. CVSS v3 base score is 6.5 out of 10.