DEBIAN-CVE-2026-42859

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Source
https://security-tracker.debian.org/tracker/CVE-2026-42859
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42859.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-42859
Upstream
Published
2026-05-11T18:16:36Z
Modified
2026-09-14T17:03:35Z
Severity
  • 8.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

Neat VNC is a VNC server library. Prior to 0.9.6, a pre-authentication stack buffer overflow exists in neatvnc in the RSA-AES security type handler. An unauthenticated remote attacker who can reach the VNC listening socket can send a crafted security type 5 (RSA-AES) or security type 129 (RSA-AES-256) handshake with an oversized client RSA public key, causing rsa_aes_send_challenge in src/auth/rsa-aes.c to overflow a 1024-byte on-stack buffer when encrypting the server challenge. This results in at least a denial of service via server crash. This vulnerability is fixed in 0.9.6.

References

Affected packages

Debian:12 / neatvnc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.5.4+dfsg-1
0.5.4+dfsg-2~exp1
0.6.0+dfsg-1
0.6.0+dfsg-2
0.6.0+dfsg-3
0.6.0+dfsg-4
0.7.0+dfsg-1~exp1
0.7.0+dfsg-1
0.7.1+dfsg-1
0.7.1+dfsg-2
0.8.0+dfsg-1
0.8.0+dfsg-2
0.8.0+dfsg-3
0.9.1+dfsg-1
0.9.1+dfsg-1.1
1.*
1.0.0+dfsg-1~exp1
1.0.1+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42859.json"

Debian:13 / neatvnc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.1+dfsg-1
0.9.1+dfsg-1.1
1.*
1.0.0+dfsg-1~exp1
1.0.1+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42859.json"

Debian:14 / neatvnc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.1+dfsg-1.1

Affected versions

0.*
0.9.1+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42859.json"