CVE-2026-88383 Denial of service in n/a
An attacker can cause a denial of service by triggering undefined behavior in libical via incompatible function pointer usage during iCalendar parsing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-88383?
CVE-2026-88383 is a medium-severity denial of service vulnerability in n/a, published on 24 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
libical 4.0.6 contains an incompatible function pointer in icalparameter_string_to_kind(). When parsing iCalendar data containing a parameterized property, the function passes icalparameter_compare_kind_map() to bsearch() through an incompatible comparator function pointer type. bsearch() invokes the callback through the mismatched type, resulting in undefined behavior and process termination, leading to denial of service.
Weakness: CWE-843
Which versions are affected by CVE-2026-88383?
How do I fix CVE-2026-88383?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-88383 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88383 exists.
Sources
Also known as AZL-106797, DEBIAN-CVE-2026-88383, GHSA-r8r2-rvrx-7xqq, OESA-2026-4376, OESA-2026-4377, OESA-2026-4378 and 2 more.