CVE-2021-23343 Regular Expression Denial of Service (ReDoS)
Attackers can cause denial of service in applications using the path-parse library by triggering polynomial time complexity in regular expressions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-23343?
CVE-2021-23343 is a medium-severity denial of service vulnerability in path-parse, published on 4 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
All versions of package path-parse are vulnerable to Regular Expression Denial of Service (ReDoS) via splitDeviceRe, splitTailRe, and splitPathRe regular expressions. ReDoS exhibits polynomial worst-case time complexity.
Which versions are affected by CVE-2021-23343?
2 open source packages ship an affected version, including path-parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
path-parse npm | All versions | 1.0.7 |
path-parse npm | All versions | 1.0.7 |
Products include Path-Parse Project Path-Parse.
How do I fix CVE-2021-23343?
Upgrade path-parse to 1.0.7 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 CVE-2021-23343 being exploited?
There is no known exploitation of CVE-2021-23343 in the wild and no public exploit code.
Sources
Also known as GHSA-hj48-42vr-x3v9, OESA-2021-1262.