CVE Explorer
CVE-2026-32853
LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","packageURL":"pkg:github/LibVNC/libvncserver","product":"LibVNCServer","repo":"https://github.com/LibVNC/libvncserver","vendor":"LibVNC","versions":[{"lessThanOrEqual":"0.9.15","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"009008e2f4d5a54dd71f422070df3af7b3dbc931","versionType":"git"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3d8de37b6debb516e970c356ade308e7334142605c861afa6342beba04ff21f5 · sha256:04297fc4288c566c… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3d8de37b6debb516e970c356ade308e7334142605c861afa6342beba04ff21f5 · sha256:04297fc4288c566c… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds read","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3d8de37b6debb516e970c356ade308e7334142605c861afa6342beba04ff21f5 · sha256:04297fc4288c566c… · /containers/cna/problemTypes/0/descriptions/0
Source references
4 source assertions{"tags":["patch"],"url":"https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d8de37b6debb516e970c356ade308e7334142605c861afa6342beba04ff21f5 · sha256:04297fc4288c566c… · /containers/cna/references/1
{"tags":["vendor-advisory"],"url":"https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d8de37b6debb516e970c356ade308e7334142605c861afa6342beba04ff21f5 · sha256:04297fc4288c566c… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d8de37b6debb516e970c356ade308e7334142605c861afa6342beba04ff21f5 · sha256:04297fc4288c566c… · /containers/adp/0/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3d8de37b6debb516e970c356ade308e7334142605c861afa6342beba04ff21f5 · sha256:04297fc4288c566c… · /containers/cna/references/2
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.