PatchTheCVECVE-2024-1899: An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denia
CVE-2024-1899 is a medium-severity flaw (CVSS 5.3) affecting showdown. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 43%) |
| CISA exploited list | No |
| Weakness | CWE-674 |
| Published | 2024-02-26 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2024-1899?
showdown: upgrade to newer than 2.1.0. Exact commands for each OS are on this page.
Is CVE-2024-1899 being exploited?
CVE-2024-1899 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2024-1899 affect?
CVE-2024-1899 affects showdown. Severity is medium (CVSS 5.3). An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
How urgent is CVE-2024-1899?
Priority 43/100. Public exploit reference; Remotely exploitable, no login, no user action