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Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck

CVE-2026-110602libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path

Medium 6.3

In plain English

A medium-severity security flaw in libmspack from kyz. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.2%top 85.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libmspackno fix listedDEBIAN-CVE-2026-110602
Debian:13libmspackno fix listedDEBIAN-CVE-2026-110602
Debian:14libmspack0.11-2DEBIAN-CVE-2026-110602
Ubuntu:22.04:LTSlibmspack0.10.1-2ubuntu0.1USN-8973-1
Ubuntu:22.04:LTSlibmspack0.10.1-2ubuntu0.1UBUNTU-CVE-2026-110602
Ubuntu:24.04:LTSlibmspack0.11-1.1ubuntu0.24.04.1USN-8973-1
Ubuntu:24.04:LTSlibmspack0.11-1.1ubuntu0.24.04.1UBUNTU-CVE-2026-110602
Ubuntu:26.04:LTSlibmspack0.11-1.1ubuntu0.26.04.1UBUNTU-CVE-2026-110602
Ubuntu:26.04:LTSlibmspack0.11-1.1ubuntu0.26.04.1USN-8973-1
Ubuntu:26.10libmspack0.11-1.1ubuntu0.26.10.1USN-8973-1
Ubuntu:26.10libmspack0.11-1.1ubuntu0.26.10.1UBUNTU-CVE-2026-110602

Affected products (as reported)

VendorProductVersions
kyz libmspack 0 – through 0.11alpha

Weakness: CWE-824 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H

References