What’s Vulnerable › Vulnerabilities

CVE-2025-9670: mixmark-io turndown commonmark-rules.js redos

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-29 · updated 2026-10-18
• Weakness: CWE-400

Description

A security flaw has been discovered in mixmark-io turndown up to 7.2.1. This affects an unknown function of the file src/commonmark-rules.js. Performing manipulation results in inefficient regular expression complexity. It is possible to initiate the attack remotely. The exploit has been released to the public and may be exploited.

Affected products

• mixmark-io turndown: 7.2.0, 7.2.1

References

• https://github.com/mixmark-io/turndown/issues/501
• https://github.com/mixmark-io/turndown/issues/501#issue-3336342088
• https://vuldb.com/?ctiid.321880
• https://vuldb.com/?id.321880
• https://vuldb.com/?submit.637911

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