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CVE-2026-32854

Libvncserver NULL pointer dereference

7.5 HIGHPublic exploitEPSS 5.32%
  1. Published24 Mar 2026

Description

LibVNCServer versions 0.9.15 and prior (fixed in commit dc78dee) contain null pointer dereference vulnerabilities in the HTTP proxy handlers within httpProcessInput() in httpd.c that allow remote attackers to cause a denial of service by sending specially crafted HTTP requests. Attackers can exploit missing validation of strchr() return values in the CONNECT and GET proxy handling paths to trigger null pointer dereferences and crash the server when httpd and proxy features are enabled.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Libvncserver< 0.9.15

Remediation

Fixed in
Libvncserver≥ 0.9.15

References

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Frequently asked

Is CVE-2026-32854 being actively exploited?

CVE-2026-32854 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 5.32%.

How severe is CVE-2026-32854?

CVE-2026-32854 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 5.32% probability of exploitation.

Which products are affected by CVE-2026-32854?

Affected products include Libvncserver.

How do I fix CVE-2026-32854?

Upgrade affected software to a fixed version, for example Libvncserver 0.9.15 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-32854 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.