CVE-2026-32853

high

Published 2026-06-23 · Modified 2026-07-14

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CVSS v3

8.1

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

CVSS v4 NEW

6.9

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

VIR risk

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.

Predictions

Exploit likelihood

88%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`0.9.15+dfsg-1+deb13u1`
sid	Fixed	`0.9.15+dfsg-3`
forky	Fixed	`0.9.15+dfsg-3`
bullseye	Affected	—
bookworm	Fixed	`0.9.14+dfsg-1+deb12u1`

Ubuntu Fixed 4 releases

Version	Status	Fixed in
resolute	Fixed	`0.9.15+dfsg-3ubuntu0.1`
questing	Fixed	`0.9.15+dfsg-1ubuntu0.1`
noble	Fixed	`0.9.14+dfsg-1ubuntu0.1`
jammy	Fixed	`0.9.13+dfsg-3ubuntu0.1`

Application impact

Vendor	Product	Versions	Fixed
libvncserver_project	libvncserver	`{"endExcluding":"0.9.15"}`	`0.9.15`

References

CWEs

CWE-125

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.