GHSA-v2p6-4mp7-3r9v Regular Expression Denial of Service in underscore.string
An attacker can cause a denial of service in applications using underscore.string by submitting specially crafted input to the unescapeHTML function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-v2p6-4mp7-3r9v?
GHSA-v2p6-4mp7-3r9v is a denial of service vulnerability in underscore.string, published on 14 Jun 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Versions of underscore.string prior to 3.3.5 are vulnerable to Regular Expression Denial of Service (ReDoS).
The function unescapeHTML is vulnerable to ReDoS due to an overly-broad regex. The slowdown is approximately 2s for 50,000 characters but grows exponentially with larger inputs.
Recommendation
Upgrade to version 3.3.5 or higher.
Which versions are affected by GHSA-v2p6-4mp7-3r9v?
2 open source packages ship an affected version, including underscore.string.
| Package | Affected | Fixed in |
|---|---|---|
underscore.string npm | All versions | 3.3.5 |
underscore.string npm | All versions | 3.3.5 |
How do I fix GHSA-v2p6-4mp7-3r9v?
Upgrade underscore.string to 3.3.5 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-v2p6-4mp7-3r9v being exploited?
There is no known exploitation of GHSA-v2p6-4mp7-3r9v in the wild and no public exploit code.