CVE-2023-4241 lol-html panics on certain HTML inputs
Attackers can cause a denial of service by providing specific HTML inputs to the lol-html library, affecting applications processing untrusted HTML.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-4241?
CVE-2023-4241 is a high-severity denial of service vulnerability in Cloudflare lol-html, published on 16 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
lol-html can cause panics on certain HTML inputs. Anyone processing arbitrary 3rd party HTML with the library is affected.
Weakness: CWE-20
Which versions are affected by CVE-2023-4241?
2 open source packages ship an affected version, including lol-html. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
lol-html crates.io | All versions | 1.1.1 |
lol-html crates.io | All versions | 1.1.1 |
Products include Cloudflare Lol-Html.
How do I fix CVE-2023-4241?
Upgrade lol-html to 1.1.1 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-2023-4241 being exploited?
There is no known exploitation of CVE-2023-4241 in the wild and no public exploit code.
Sources
Also known as GHSA-c3x7-354f-4p2x.