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CVE-2026-32854

LibVNCServer versions 0.9.15 and prior (fixed…

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.

Gravidade: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Mar 24, 2026, 5:31:32 PM UTC
Source: [NVD] · [CVE record]
EPSS: 5.42% · Oct 27, 2026

Projects and upstream resources

[libvncserver][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie	libvncserver	`0.9.15+dfsg-1+deb13u1`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debiantrixie	libvncserver	`0.9.15+dfsg-1+deb13u2`	Fixed	[CVE-2026-32854]
Debiansid	libvncserver	`0.9.15+dfsg-3`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debiansid	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2026-32854]
Debianforky	libvncserver	`0.9.15+dfsg-3`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debianforky	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2026-32854]
Debianbookworm	libvncserver	`0.9.14+dfsg-1+deb12u1`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debianbookworm	libvncserver	`0.9.14+dfsg-1+deb12u2`	Fixed	[CVE-2026-32854]

Showing 8 fix observations. All 13 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	libvncclient1	`0.9.14+dfsg-1ubuntu0.1`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	libvncserver	`0.9.14+dfsg-1+deb12u1`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	libvncserver	`0.9.14+dfsg-1ubuntu0.1`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	libvncserver-dev	`0.9.14+dfsg-1ubuntu0.1`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	libvncserver1	`0.9.14+dfsg-1ubuntu0.1`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	libvncserver	`0.9.14+dfsg-1+deb12u1`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debianbookworm	libvncserver	`0.9.14+dfsg-1+deb12u2`	Fixed	[CVE-2026-32854]
Debianforky	libvncserver	`0.9.15+dfsg-3`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debianforky	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2026-32854]
Debiansid	libvncserver	`0.9.15+dfsg-3`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debiansid	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2026-32854]
Debiantrixie	libvncserver	`0.9.15+dfsg-1+deb13u1`	FixedDistribution-reported fixed boundary	[CVE-2026-32854]
Debiantrixie	libvncserver	`0.9.15+dfsg-1+deb13u2`	Fixed	[CVE-2026-32854]

Original provider fields

{
  "package_releases": [
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "sid",
      "version": "0.9.15+dfsg-6"
    },
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "forky",
      "version": "0.9.15+dfsg-6"
    },
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "trixie",
      "version": "0.9.15+dfsg-1+deb13u2"
    },
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "bookworm",
      "version": "0.9.14+dfsg-1+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1132017,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.15+dfsg-3"
    },
    {
      "bug": 1132017,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.15+dfsg-3"
    },
    {
      "bug": 1132017,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.15+dfsg-1+deb13u1"
    },
    {
      "bug": 1132017,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.14+dfsg-1+deb12u1"
    }
  ],
  "distribution_packages": [
    {
      "name": "libvncserver",
      "fixed_version": "0.9.14+dfsg-1ubuntu0.1",
      "applicability_unknown": true
    },
    {
      "name": "libvncclient1",
      "fixed_version": "0.9.14+dfsg-1ubuntu0.1",
      "applicability_unknown": true
    },
    {
      "name": "libvncserver-dev",
      "fixed_version": "0.9.14+dfsg-1ubuntu0.1",
      "applicability_unknown": true
    },
    {
      "name": "libvncserver1",
      "fixed_version": "0.9.14+dfsg-1ubuntu0.1",
      "applicability_unknown": true
    },
    {
      "name": "libvncserver",
      "fixed_version": "0.9.14+dfsg-1+deb12u1",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #1132017]

OpenFactory catalog packages

A associação de pacotes está em andamento.

[Debian 12 (Bookworm)]

[libvncclient1]Desconhecido
Pacote fonte: [libvncserver]
Detalhes (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Corrigida · Corrigida: 0.9.14+dfsg-1+deb12u1
  nvd · libvncserver · debian · bookworm; nvd · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Corrigida · Corrigida: 0.9.14+dfsg-1+deb12u1
  nvd · libvncserver · debian · bookworm; nvd · libvncserver · debian · 12
[libvncserver1]Desconhecido
Pacote fonte: [libvncserver]
Detalhes (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Corrigida · Corrigida: 0.9.14+dfsg-1+deb12u1
  nvd · libvncserver · debian · bookworm; nvd · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Corrigida · Corrigida: 0.9.14+dfsg-1+deb12u1
  nvd · libvncserver · debian · bookworm; nvd · libvncserver · debian · 12
[libvncserver-dev]Desconhecido
Pacote fonte: [libvncserver]
Detalhes (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Corrigida · Corrigida: 0.9.14+dfsg-1+deb12u1
  nvd · libvncserver · debian · bookworm; nvd · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Corrigida · Corrigida: 0.9.14+dfsg-1+deb12u1
  nvd · libvncserver · debian · bookworm; nvd · libvncserver · debian · 12

[Debian 13 (Trixie)]

[libvncclient1]Desconhecido
Pacote fonte: [libvncserver]
Detalhes (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Corrigida · Corrigida: 0.9.15+dfsg-1+deb13u1
  nvd · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Corrigida · Corrigida: 0.9.15+dfsg-1+deb13u1
  nvd · libvncserver · debian · 13
[libvncserver1]Desconhecido
Pacote fonte: [libvncserver]
Detalhes (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Corrigida · Corrigida: 0.9.15+dfsg-1+deb13u1
  nvd · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Corrigida · Corrigida: 0.9.15+dfsg-1+deb13u1
  nvd · libvncserver · debian · 13
[libvncserver-dev]Desconhecido
Pacote fonte: [libvncserver]
Detalhes (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Corrigida · Corrigida: 0.9.15+dfsg-1+deb13u1
  nvd · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Corrigida · Corrigida: 0.9.15+dfsg-1+deb13u1
  nvd · libvncserver · debian · 13

Observado: Oct 23, 2026, 10:39:03 PM UTC

Referências

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]