What is CVE-2026-44988?

CVE-2026-44988 is a high-severity vulnerability in Libvnc Libvncserver, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-05-27.

How severe is CVE-2026-44988?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Libvnc Libvncserver

CVE-2026-44988

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 who…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (13.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Libvnc Libvncserver — versions <= 0.9.15

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-44988?: CVE-2026-44988 is a high-severity vulnerability in Libvnc Libvncserver, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2026-05-27.
How severe is CVE-2026-44988?: High severity. CVSS v3 base score is 8.8 out of 10.