CVE-2026-110602 libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path
Attackers can trigger memory corruption or crashes in libmspack by providing malformed KWAJ files, potentially leading to arbitrary code execution.
- 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-2026-110602?
CVE-2026-110602 is a medium-severity memory corruption vulnerability in kyz libmspack, published on 14 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
libmspack through 0.11alpha contains an uninitialized pointer free vulnerability in kwajd_open() in mspack/kwajd.c that frees unzeroed filename and extra pointers on header read errors. Attackers can supply a truncated, empty, or wrong-signature KWAJ file to crash the process or obtain an arbitrary-free memory corruption primitive.
Weakness: CWE-824
Which versions are affected by CVE-2026-110602?
How do I fix CVE-2026-110602?
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-2026-110602 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110602 exists.
Sources
Also known as AZL-108330, AZL-108393, BELL-CVE-2026-110602, DEBIAN-CVE-2026-110602, ECHO-4860-e2e2-8381, GHSA-5m37-fqj8-q94j and 1 more.