CVE-2026-78376 Webkitgtk: use-after-free of jscvalue function parameters
Attackers can execute arbitrary code by exploiting a use-after-free vulnerability in WebKitGTK when processing malicious web content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-78376?
CVE-2026-78376 is a high-severity use after free vulnerability in Red Hat Enterprise Linux 6, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A flaw was found in WebKitGTK. Processing malicious web content can cause a use-after-free issue due to improper memory handling and result in memory corruption.
Weakness: CWE-416
Which versions are affected by CVE-2026-78376?
How do I fix CVE-2026-78376?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-78376 being exploited?
There is no known exploitation of CVE-2026-78376 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-78376, ECHO-1c9d-3961-cc2b, GHSA-qcc7-6r53-qpph, UBUNTU-CVE-2026-78376.