DEBIAN-CVE-2026-44988

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Source
https://security-tracker.debian.org/tracker/CVE-2026-44988
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44988.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-44988
Upstream
Published
2026-05-27T15:16:29Z
Modified
2026-09-01T16:06:44Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient's Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but it does not reject Tight rectangles whose width is larger than 2048 pixels. A malicious VNC server can send a crafted FramebufferUpdate rectangle using Tight encoding with NoZlib | ExplicitFilter and the Gradient filter. When a LibVNCClient-based client connects, the client processes the server-controlled rectangle width and writes beyond fixed-size Gradient buffers. This vulnerability is fixed with commit 5b270544b85233668b98161323297d418a8f5fd1.

References

Affected packages

Debian:12 / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/debian/libvncserver?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.14+dfsg-1+deb12u2

Affected versions

0.*
0.9.14+dfsg-1
0.9.14+dfsg-1+deb12u1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44988.json"

Debian:13 / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/debian/libvncserver?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.15+dfsg-1+deb13u2

Affected versions

0.*
0.9.15+dfsg-1
0.9.15+dfsg-1+deb13u1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44988.json"

Debian:14 / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/debian/libvncserver?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.15+dfsg-5

Affected versions

0.*
0.9.15+dfsg-1
0.9.15+dfsg-2
0.9.15+dfsg-3
0.9.15+dfsg-4

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44988.json"