What is CVE-2026-44042?

CVE-2026-44042 is a low-severity vulnerability in Uvnc Ultravnc, classified under Off-by-one Error. CVSS score: 3.7/10. Published 2026-07-01.

How severe is CVE-2026-44042?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Uvnc Ultravnc

CVE-2026-44042

UltraVNC repeater through 1.8.2.2 contains an off-by-one error in the Base64 decode helper used for HTTP Basic authentication. In repeater/webgui/webutils.c:817, the wi_uudecode() function checks whether the input length exceeds the output…

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Uvnc Ultravnc — versions 0

Weakness classification (CWE)

CWE-193 — Off-by-one Error

References

33c584b5-0579-4c06-b2a0-8d8329fcab9c (vendor-advisory)
33c584b5-0579-4c06-b2a0-8d8329fcab9c (product)

Frequently asked questions

What is CVE-2026-44042?: CVE-2026-44042 is a low-severity vulnerability in Uvnc Ultravnc, classified under Off-by-one Error. CVSS score: 3.7/10. Published 2026-07-01.
How severe is CVE-2026-44042?: Low severity. CVSS v3 base score is 3.7 out of 10.