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CVE-2026-32853

HIGH

8.1

Description

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.

Details CVE

Score CVSS v3.18.1

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurREQUIRED

Publie3/24/2026

Derniere modification3/25/2026

Sourcenvd

Observations honeypot0

Produits affectes

libvncserver_project:libvncserver

Faiblesses (CWE)

CWE-125

References

https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931(disclosure@vulncheck.com)

https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read(disclosure@vulncheck.com)

https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

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