CVE-2021-26813
markdown2 Regular Expression Denial of Service
7.5
HIGH
CVSS 3.1
EPSS 0.50%
Description
markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.
How to fix CVE-2021-26813
To remediate CVE-2021-26813, upgrade the affected package to a fixed version below.
- —upgrade to 2.3.10-1.1 or later
- —upgrade to 2.4.0 or later
- —upgrade to 2.4.0 or later
Is CVE-2021-26813 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 2.3.10-1.1
- >= 1.0.1.18, < 2.4.0
- >= 1.0.1.18, < 2.4.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |