7.5

CVE-2026-32854: libvnc libvncserver NULL Pointer Dereference

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-32854DEBIAN-CVE-2026-32854
Published 24-03-2026Last modified 14-07-2026
Open JSON

Vulnerability summary

CVE-2026-32854 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in libvnc libvncserver. EPSS estimates a 5.32% chance of exploitation in the next 30 days, higher than 92.5% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
41/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
5.32%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 8 · Related 7
MGASA-2026-0315OPENSUSE-SU-2026:10433-1OPENSUSE-SU-2026:20552-1SUSE-SU-2026:1124-1SUSE-SU-2026:1173-1SUSE-SU-2026:1174-1

Timeline

  1. 24-03-2026
    PublishedVulnerability first disclosed.
  2. 14-07-2026
    Last modifiedVulnerability information updated.

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 metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

5.32%

Chance of exploitation in the next 30 days

Percentile

93%

Versus all other CVEs

30-day change

0.00 pp

From 5.32% on 18-09-2026

18-09-202618-10-2026
EPSS score
5.32%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Libvncserver

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Ubuntu6 products
  • italcAll versions (No fix recorded)
  • libvncserverAll versions (No fix recorded) | < 0.9.13+dfsg-3ubuntu0.1 | < 0.9.14+dfsg-1ubuntu0.1 | < 0.9.15+dfsg-1ubuntu0.1
  • tightvncAll versions (No fix recorded)
  • veyonAll versions (No fix recorded)
  • vinoAll versions (No fix recorded)
Debian1 product
  • libvncserver< 0.9.14+dfsg-1+deb12u1 | < 0.9.15+dfsg-1+deb13u1 | < 0.9.15+dfsg-3
Libvnc1 product
Libvncserver_project1 product

4 vendors · 9 products

References

7 links