{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-42859 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-42859 is a high-severity memory corruption vulnerability in any1 neatvnc, published on 11 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42859 and fix it if it is affected.\n\nWhat it is: CVE-2026-42859 is a high-severity memory corruption vulnerability in any1 neatvnc, published on 11 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-42859 in the wild and no public exploit code.\n\nAffected product: any1 neatvnc. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-42859/ (Markdown: https://insights.sbomify.com/CVE-2026-42859/index.md)","id":"CVE-2026-42859","markdown":"https://insights.sbomify.com/CVE-2026-42859/index.md","name":"CVE-2026-42859","record":{"aliases":["DEBIAN-CVE-2026-42859","GHSA-567c-gpv8-qh9h","UBUNTU-CVE-2026-42859"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"VNC server library","requires_auth":"none","summary":"An unauthenticated remote attacker can crash the VNC server by sending oversized RSA public keys, causing a stack buffer overflow.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U","version":"4.0"},"cwes":[{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Neat VNC: Buffer overflow due to oversized RSA public keys","id":"CVE-2026-42859","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Open edx Enterprise Service: SSRF via SAML metadata URL in sync_provider_data endpoint","id":"CVE-2026-42860"},"packages":[],"prev":{"headline":"Open edX Platform: Server-Side Request Forgery (SSRF) in SAML Provider Data Sync Endpoint","id":"CVE-2026-42858"},"products":["neatvnc"],"published":"2026-05-11","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["any1"]},"summary":"An unauthenticated remote attacker can crash the VNC server by sending oversized RSA public keys, causing a stack buffer overflow.","url":"https://insights.sbomify.com/CVE-2026-42859/"}