CVE-2026-42859— Neat VNC: Buffer overflow due to oversized RSA public keys
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I. Basic Information for CVE-2026-42859
Vulnerability Information
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Vulnerability Title
Neat VNC: Buffer overflow due to oversized RSA public keys
Source: NVD (National Vulnerability Database)
Vulnerability Description
Neat VNC is a VNC server library. Prior to 0.9.6, a pre-authentication stack buffer overflow exists in neatvnc in the RSA-AES security type handler. An unauthenticated remote attacker who can reach the VNC listening socket can send a crafted security type 5 (RSA-AES) or security type 129 (RSA-AES-256) handshake with an oversized client RSA public key, causing rsa_aes_send_challenge in src/auth/rsa-aes.c to overflow a 1024-byte on-stack buffer when encrypting the server challenge. This results in at least a denial of service via server crash. This vulnerability is fixed in 0.9.6.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Neat VNC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Neat VNC是Andri Yngvason个人开发者的一个自由许可的 VNC 服务器库。 Neat VNC 0.9.6之前版本存在安全漏洞，该漏洞源于RSA-AES安全类型处理器中存在预认证栈缓冲区溢出，可能导致未认证远程攻击者通过发送特制RSA公钥造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-42859
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- https://github.com/any1/neatvnc/security/advisories/GHSA-567c-gpv8-qh9hx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42859
IV. Related Vulnerabilities
V. Comments for CVE-2026-42859
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