Vulnerability in Tigervnc

CVE-2025-26599

An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validat…

EPSS: 0.004 (29.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-26599?
CVE-2025-26599 is a high-severity vulnerability in Tigervnc, classified under Access of Uninitialized Pointer. CVSS score: 7.8/10. Published 2025-02-25.
How severe is CVE-2025-26599?
High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2025-26599 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.