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Vulnerability · Published Aug 29, 2025 · Assigned by VulDB

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

Medium 5.3

In plain English

A medium-severity regular-expression denial of service in turndown from mixmark-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 57.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12node-turndownno fix listedDEBIAN-CVE-2025-9670
Debian:13node-turndownno fix listedDEBIAN-CVE-2025-9670
Debian:14node-turndown7.2.2+~2.2.0~git20240406-1DEBIAN-CVE-2025-9670
Ubuntu:22.04:LTSnode-turndownno fix listedUBUNTU-CVE-2025-9670
Ubuntu:24.04:LTSnode-turndownno fix listedUBUNTU-CVE-2025-9670
Ubuntu:25.10node-turndownno fix listedUBUNTU-CVE-2025-9670
Ubuntu:26.04:LTSnode-turndownno fix listedUBUNTU-CVE-2025-9670
Ubuntu:26.10node-turndownno fix listedUBUNTU-CVE-2025-9670

Affected products (as reported)

VendorProductVersions
mixmark-io turndown 7.2.07.2.1

Weakness: CWE-1333, CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

References