Vulnerability in Kramdown Project
CVE-2021-28834
Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000
Affected products
- Kramdown Project
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 32, 33, 34
References
- github.com/gettalong/kramdown/pull/708 (Exploit, Third Party Advisory)
- gitlab.com/gitlab-org/gitlab/-/commit/179329b5c3c118924fb242dc449d06b4ed6ccb66 (Patch, Third Party Advisory)
- github.com/gettalong/kramdown/compare/REL_2_3_0...REL_2_3_1 (Patch, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.debian.org/security/2021/dsa-4890 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-28834?
- CVE-2021-28834 is a critical-severity vulnerability in Kramdown Project. CVSS score: 9.8/10. Published 2021-03-19.
- How severe is CVE-2021-28834?
- Critical severity. CVSS v3 base score is 9.8 out of 10.