libvncserver: LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in t...
CVE-2026-32853 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-32853, released March 24, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| LibVNCServer · opensuse-leap 15.6 | 0.9.14-150600.3.6.1 | SUSE-SU-2026:1173-1 | Apr 2, 2026 |
| LibVNCServer · opensuse-leap 16.0 | 0.9.14-160000.4.1 | OPENSUSE-SU-2026:20552-1 | Apr 16, 2026 |
| LibVNCServer · sles 15.7 | 0.9.14-150600.3.6.1 | SUSE-SU-2026:1173-1 | Apr 2, 2026 |
| LibVNCServer · sles 16.0 | 0.9.14-160000.4.1 | SUSE-SU-2026:21206-1 | Apr 16, 2026 |
| libvncclient1 · Ubuntu 22.04.1 LTS (jammy) | 0.9.13+dfsg-3ubuntu0.1 | libvncclient1 0.9.13+dfsg-3ubuntu0.1 | Jun 24, 2026 |
| libvncclient1 · Ubuntu 24.04.5 LTS (noble) | 0.9.14+dfsg-1ubuntu0.1 | libvncclient1 0.9.14+dfsg-1ubuntu0.1 | Jun 24, 2026 |
| libvncclient1 · Ubuntu 25.10 (questing) | 0.9.15+dfsg-1ubuntu0.1 | libvncclient1 0.9.15+dfsg-1ubuntu0.1 | Jun 24, 2026 |
| libvncserver · Debian 12.15 (bookworm) | 0.9.14+dfsg-1+deb12u1 | DEBIAN-CVE-2026-32853 | Mar 24, 2026 |
| libvncserver · Debian 13.5 (trixie) | 0.9.15+dfsg-1+deb13u1 | DEBIAN-CVE-2026-32853 | Mar 24, 2026 |
| libvncserver · Debian 14 | 0.9.15+dfsg-3 | DEBIAN-CVE-2026-32853 | Mar 24, 2026 |
| libvncserver1 · Ubuntu 22.04.1 LTS (jammy) | 0.9.13+dfsg-3ubuntu0.1 | libvncserver1 0.9.13+dfsg-3ubuntu0.1 | Jun 24, 2026 |
| libvncserver1 · Ubuntu 24.04.5 LTS (noble) | 0.9.14+dfsg-1ubuntu0.1 | libvncserver1 0.9.14+dfsg-1ubuntu0.1 | Jun 24, 2026 |
| libvncserver1 · Ubuntu 25.10 (questing) | 0.9.15+dfsg-1ubuntu0.1 | libvncserver1 0.9.15+dfsg-1ubuntu0.1 | Jun 24, 2026 |
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