What is CVE-2026-83596?

CVE-2026-83596 is a high-severity vulnerability in Webkit, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-08-31.

How severe is CVE-2026-83596?

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

Buffer overflow in Webkit

CVE-2026-83596

A flaw was found in WebKitGTK. Processing malicious web content can cause memory corruption due to improper memory handling.

Vulnerability class: Buffer Overflow

Published 2026-08-31 · last modified 2026-09-30.

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.

EPSS exploit prediction

EPSS: 0.003 (20.5th percentile), scored 2026-10-16.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

access.redhat.com/security/cve/CVE-2026-83596 (vdb-entry)
bugs.webkit.org/show_bug.cgi
bugzilla.redhat.com/show_bug.cgi (issue-tracking)
access.redhat.com/errata/RHSA-2026:69098 (vendor-advisory)
access.redhat.com/errata/RHSA-2026:74084 (vendor-advisory)

Frequently asked questions

What is CVE-2026-83596?: CVE-2026-83596 is a high-severity vulnerability in Webkit, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-08-31.
How severe is CVE-2026-83596?: High severity. CVSS v3 base score is 8.8 out of 10.