CVE Explorer
CVE-2026-42859
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
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"neatvnc","vendor":"any1","versions":[{"status":"affected","version":"< 0.9.6"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:08d0757bc1126c5ecc1c69cf81dab486a6d65e6d8332682aaba080dc7179460c · sha256:52f07bd95e375ba5… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.1,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:08d0757bc1126c5ecc1c69cf81dab486a6d65e6d8332682aaba080dc7179460c · sha256:52f07bd95e375ba5… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-120","description":"CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:08d0757bc1126c5ecc1c69cf81dab486a6d65e6d8332682aaba080dc7179460c · sha256:52f07bd95e375ba5… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/any1/neatvnc/commit/1f6cd6b75cc167fed3a19a9d1552a1f662f6b337","tags":["x_refsource_MISC"],"url":"https://github.com/any1/neatvnc/commit/1f6cd6b75cc167fed3a19a9d1552a1f662f6b337"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:08d0757bc1126c5ecc1c69cf81dab486a6d65e6d8332682aaba080dc7179460c · sha256:52f07bd95e375ba5… · /containers/cna/references/1
{"name":"https://github.com/any1/neatvnc/security/advisories/GHSA-567c-gpv8-qh9h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/any1/neatvnc/security/advisories/GHSA-567c-gpv8-qh9h"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:08d0757bc1126c5ecc1c69cf81dab486a6d65e6d8332682aaba080dc7179460c · sha256:52f07bd95e375ba5… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.