CVE-2021-26813 describes a Regular Expression Denial of Service (ReDoS) vulnerability affecting markdown2 versions 1.0.1.18 through 2.3.x. An unauthenticated attacker can exploit this by submitting a specially crafted string, causing the markdown2 processor to consume excessive resources and become unresponsive. This vulnerability carries a high severity CVSS score of 7.5, indicating a network-based attack with low complexity and a high impact on availability. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 1.0.1.18, < 2.4.0CPE matchmatch criteria | cpe:2.3:a:markdown2_project:markdown2:*:*:*:*:*:*:*:* | ||
32CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | ||
34CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.