CVE-2024-1899
Showdownjs Denial of Service
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Showdownjs Denial of Service
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
- Record
CVE-2024-1899- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-674
- Updated
- 2026-11-02
EUVDEUVD-2024-17621
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
- Record
EUVD-2024-17621- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rmmh-p597-ppvv
Showdown vulnerable to Regular Expression Denial of Service (ReDoS) in link/anchor parsing
Showdownjs, versions <= 2.1.0, anchors subparser used to parse links has a nested regular expression which can lead to denial of service conditions given malicious input.
- Record
GHSA-rmmh-p597-ppvv- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-674, CWE-777
- Updated
- 2026-11-02
NVD
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
- Record
CVE-2024-1899- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-674
- Updated
- 2026-11-02
OSV
Showdownjs Denial of Service
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
- Record
CVE-2024-1899- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVGHSA-rmmh-p597-ppvv
Showdown vulnerable to Regular Expression Denial of Service (ReDoS) in link/anchor parsing
Showdownjs, versions <= 2.1.0, anchors subparser used to parse links has a nested regular expression which can lead to denial of service conditions given malicious input.
- Record
GHSA-rmmh-p597-ppvv- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-674, CWE-777
- Updated
- 2026-11-02
OSVROOT-APP-NPM-CVE-2024-1899
CVE-2024-1899 in @rootio/showdown - Patched by Root
Root has patched CVE-2024-1899 in the @rootio/showdown package for Root:npm. Multiple fixed versions available.
- Record
ROOT-APP-NPM-CVE-2024-1899- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
showdownnpm |
through 2.1.0 | None known |
@rootio/showdownRoot:npm |
before 2.1.0-root.io.1 | 2.1.0-root.io.1 |
showdownRoot:npm |
before 2.1.0-aikido.1 | 2.1.0-aikido.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-1899 is a medium vulnerability (CVSS 5.3) in Showdownjs Showdown, published February 26, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.81%, the 57th percentile. Fixed in @rootio/showdown 2.1.0-root.io.1.