Quick answers
- Is This vulnerability exploited in the wild?
- No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
- How severe is This vulnerability?
- Informational severity, published 3 September 2020.
- Which products and versions are affected?
- marked (npm) SEMVER:introduced=0.4.0,fixed=0.7.0.
- Is there a fix for This vulnerability?
- Yes. marked (npm): upgrade to 0.7.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is This vulnerability attacked?
- It is attacked over the network, in a software library.
- Am I affected?
- Check whether you run marked (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- marked (npm): upgrade to 0.7.0 or later
npm install marked@0.7.0
Technical details
This vulnerability is a Regular Expression Denial of Service (ReDoS) flaw in marked's _label subrule. The affected regex pattern exhibits catastrophic backtracking when processing specially crafted or malformed Markdown input, causing exponential performance degradation. The vulnerability affects marked versions 0.4.0 through 0.6.x; it requires only network-reachable input (no authentication) and can be triggered by sending a single malicious Markdown string. An attacker can exhaust CPU resources and degrade or block parsing of legitimate documents. The fix is available in version 0.7.0 and later.
Affected products
- marked marked 0.4.0 to 0.6.x
Timeline
- 2020-09-03: disclosed