The Markdown parser in Zulip server prior to 2.0.5 used a regular expression vulnerable to exponential backtracking. A user who is logged into the server could send a crafted message causing the server to spend an effectively arbitrary amount of CPU time and stall the processing of future messages.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
zulip zulip server |
Vulmon