CVE-2026-88340 Use after free in n/a
An attacker can cause memory corruption and application crash in YARA by providing a specially crafted .yrc file during deserialization.
- 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
- None listed
What is CVE-2026-88340?
CVE-2026-88340 is a high-severity use after free vulnerability in n/a, published on 22 Sep 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
An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files. The vulnerability is caused by insufficient validation of external-variable pointers, which may lead to invalid free in yr_rules_destroy() or wild pointer access in yr_object_create(). An attacker can provide a specially crafted .yrc file that causes memory corruption and application crash.
Weakness: CWE-763
Which versions are affected by CVE-2026-88340?
How do I fix CVE-2026-88340?
No fix has been published for CVE-2026-88340 yet. Limit exposure of the affected software until one is available.
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-2026-88340 being exploited?
There is no known exploitation of CVE-2026-88340 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-88340, GHSA-f27p-cq5g-fr5x, UBUNTU-CVE-2026-88340.