SB20260425205 - Stack-based buffer overflow in neatvnc
Published: April 25, 2026
Security Bulletin ID
SB20260425205
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Stack-based buffer overflow (CVE-ID: N/A)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in rsa_aes_send_challenge in src/auth/rsa-aes.c when handling an RSA-AES security type handshake with an oversized client RSA public key. A remote attacker can send a crafted security type 5 or 129 handshake to cause a denial of service.
The issue is pre-authentication and requires network reachability to the VNC listening socket.
Remediation
Install update from vendor's website.