CVE-2020-26307 GHSL-2020-301: Regular Expression Denial of Service (ReDoS) in HTML2Markdown
Attackers can cause denial of service in HTML2Markdown library via specially crafted input triggering inefficient regular expressions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-26307?
CVE-2020-26307 is a high-severity denial of service vulnerability in kates html2markdown, published on 26 Oct 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
HTML2Markdown is a Javascript implementation for converting HTML to Markdown text. All available versions contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). As of time of publication, no known patches are available.
Weakness: CWE-1333
Which versions are affected by CVE-2020-26307?
How do I fix CVE-2020-26307?
No fix has been published for CVE-2020-26307 yet. Limit exposure of the affected software until one is available.
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-2020-26307 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-26307 exists.
Sources
Also known as GHSA-qmpf-c66x-m579.