GHSA-x6m6-5hrf-fh6r Denial of Service in markdown-it-toc-and-anchor
An attacker can cause a denial of service by providing specific markdown input that triggers an infinite loop in the table of contents generator.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-x6m6-5hrf-fh6r?
GHSA-x6m6-5hrf-fh6r is a denial of service vulnerability in markdown-it-toc-and-anchor, published on 1 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
All versions of markdown-it-toc-and-anchor are vulnerable to Denial of Service. Parsing markdown containing **text**+\n@[toc] causes the application to enter and infinite loop.
Recommendation
No fix is currently available. Consider using an alternative module until a fix is made available.
Which versions are affected by GHSA-x6m6-5hrf-fh6r?
2 open source packages ship an affected version, including markdown-it-toc-and-anchor.
| Package | Affected | Fixed in |
|---|---|---|
markdown-it-toc-and-anchor npm | All versions | 4.2.0 |
markdown-it-toc-and-anchor npm | All versions | 4.2.0 |
How do I fix GHSA-x6m6-5hrf-fh6r?
Upgrade markdown-it-toc-and-anchor to 4.2.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GHSA-x6m6-5hrf-fh6r being exploited?
There is no known exploitation of GHSA-x6m6-5hrf-fh6r in the wild and no public exploit code.