Critical · published January 1, 2026
🚨 A stack-based buffer overflow in libcoap could let a crafty attacker crash your application or, worse yet, execute their own code! 🔥 Think of it as a restaurant where someone slips an overly large dish into a tiny serving window. If the staff isn't careful, it can spill over and create a chaotic mess in the kitchen! If exploited, an attacker could crash the application, disrupting services, or even gain remote code execution access, leading to a potential takeover of the system. This could pave the way for unauthorized data access or other malicious activities, making it a high-severity concern that requires immediate attention!
Think of it as a restaurant where someone slips an overly large dish into a tiny serving window. If the staff isn't careful, it can spill over and create a chaotic mess in the kitchen! This vulnerability arises from the way libcoap handles hostname data. When attacker-controlled data is copied into a fixed 256-byte stack buffer without proper bounds checking, it leads to a stack-based buffer overflow, allowing for potential exploitation if certain conditions are met.
If exploited, an attacker could crash the application, disrupting services, or even gain remote code execution access, leading to a potential takeover of the system. This could pave the way for unauthorized data access or other malicious activities, making it a high-severity concern that requires immediate attention! To protect your systems, immediately update libcoap to the latest version where this vulnerability is patched. Also, review your applications to ensure that proxy logic is configured securely and consider implementing additional memory protections where possible. You've got this! By following these steps, you'll boost your security posture and keep the internet a little safer! 🛡️
| Product | Versions | Fixed in |
|---|---|---|
| libcoap/libcoap | ≤ 4.3.5 | — |