CVE-2026-111269 libical through 4.0.6 Heap Out-of-Bounds Read via icalvalue_decode_ical_string
Attackers can cause crashes or leak heap memory by sending iCalendar data with a trailing backslash, affecting applications using libical.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-111269?
CVE-2026-111269 is a medium-severity memory corruption vulnerability in libical, published on 15 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
libical through 4.0.6 contains a heap-based out-of-bounds read in icalvalue_decode_ical_string() in src/libical/icalvalue.c when decoding input ending in a backslash. Attackers can supply escaped iCalendar text with a trailing backslash, causing the loop to read past the terminator and crash the application or leak adjacent heap memory.
Weakness: CWE-125
Which versions are affected by CVE-2026-111269?
How do I fix CVE-2026-111269?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-111269 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111269 exists.
Sources
Also known as AZL-108293, BELL-CVE-2026-111269, DEBIAN-CVE-2026-111269, GHSA-qvfg-9jj8-868q, OESA-2026-4550, OESA-2026-4551 and 3 more.