CVE-2026-111133 libfsapfs through 20260921 Heap Out-of-Bounds Read via libfsapfs_key_encrypted_key_read_data
Attackers can trigger heap out-of-bounds reads and crashes in libfsapfs by supplying crafted APFS images with malformed key attributes.
- 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
- None listed
What is CVE-2026-111133?
CVE-2026-111133 is a medium-severity vulnerability in libyal libfsapfs, 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
libfsapfs through 20260921 contains an integer underflow in libfsapfs_key_encrypted_key_read_data() that allows attackers to trigger heap out-of-bounds reads via crafted KEK attributes. Attackers can supply a crafted encrypted APFS image with malformed HMAC or wrapped KEK attribute lengths to crash fsapfsinfo, pyfsapfs, dfVFS or plaso and read adjacent heap memory before password checks.
Weakness: CWE-125
Which versions are affected by CVE-2026-111133?
How do I fix CVE-2026-111133?
No fix has been published for CVE-2026-111133 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-111133 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111133 exists.
Sources
Also known as DEBIAN-CVE-2026-111133, GHSA-6q77-mgpq-cm3g, UBUNTU-CVE-2026-111133.