Source: neatvnc Version: CVE-2026-42859 Severity: grave Tags: security upstream X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi, The following vulnerability was published for neatvnc. CVE-2026-42859[0]: | 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. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-42859 https://www.cve.org/CVERecord?id=CVE-2026-42859 [1] https://github.com/any1/neatvnc/security/advisories/GHSA-567c-gpv8-qh9h [2] https://github.com/any1/neatvnc/commit/1f6cd6b75cc167fed3a19a9d1552a1f662f6b337 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
