What kind of vulnerability is it?
Denial of service.
The regular expression block.def may cause catastrophic backtracking against some strings.
PoC is the following.
import * as marked from "marked";
marked.parse(`[x]:${' '.repeat(1500)}x ${' '.repeat(1500)} x`);
Who is impacted?
Anyone who runs untrusted markdown through marked and does not use a worker with a time limit.
Has the problem been patched?
Yes
What versions should users upgrade to?
4.0.10
Is there a way for users to fix or remediate the vulnerability without upgrading?
Do not run untrusted markdown through marked or run marked on a worker thread and set a reasonable time limit to prevent draining resources.
Are there any links users can visit to find out more?
If you have any questions or comments about this advisory:
| Score | Percentile |
|---|---|
| 0.71% | 72.19% |
| Base score | Version | Severity | Vector |
|---|---|---|---|
| 7.5 | 3.1 | — |
|
| Type | Value |
|---|---|
| GHSA | GHSA-rrrm-qjm4-v8hf ↗ |
| CVE | CVE-2022-21680 ↗ |
Vulnerable version ranges and first patched releases as published by GitHub.
| Ecosystem | Package | Vulnerable range | First patched | Vulnerable functions |
|---|---|---|---|---|
| npm | marked | < 4.0.10 | 4.0.10 | — |