TI-2019-15235 Aliases CVE-2019-25102 GHSA-j533-2g8v-pmpg

simple-markdown simple-markdown.js redos

LOW 35CWE-1333Published 2023-02-12 · Updated 2024-08-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

A vulnerability, which was classified as problematic, was found in simple-markdown 0.6.0. Affected is an unknown function of the file simple-markdown.js. The manipulation with the input <<<<<<<<<<:/:/:/:/:/:/:/:/:/:/ leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.6.1 is able to address this issue. The patch is identified as 015a719bf5cdc561feea05500ecb3274ef609cd2. It is recommended to upgrade the affected component. VDB-220638 is the identifier assigned to this vulnerability.

Why it matters now

EPSS 0.01097 65th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix Fixed simple-markdown (npm): 0.6.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	simple-markdown	0.6.0	—	No fix listed	CNA
—	simple-markdown (npm)	before 0.6.1	0.6.1	Patch available	GHSA-j533-2g8v-pmpg

simple-markdown Vendor— Affected 0.6.0 Fixed in — No fix listed CNA
simple-markdown (npm) Vendor— Affected before 0.6.1 Fixed in 0.6.1 Patch available GHSA-j533-2g8v-pmpg

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:khanacademy:simple-markdown:0.6.0:::::node.js::	0.6.0	Vulnerable	Khanacademy

cpe:2.3:a:khanacademy:simple-markdown:0.6.0:*:*:*:*:node.js:*:* Versions 0.6.0 Vulnerable ·Khanacademy

Remediation

Fix · GHSA-j533-2g8v-pmpg simple-markdown (npm) Fixed in 0.6.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2019-25102
2026-10-03 Alias added: GHSA-j533-2g8v-pmpg

References

Exploit 1

https://github.com/ariabuckles/simple-markdown/pull/73

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2019-25102

Other 1

https://github.com/ariabuckles/simple-markdown

TI-2019-15236 simple-markdown simple-markdown.js redos CVSS 3.1HIGH 7.5
TI-2019-07226 simple-markdown.js in Khan Academy simple-markdown before 0.4.4 allows XSS via a data: or vbscript: URI. CVSS 3.0MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences