Medium severity · published Oct 14, 2026
CVE-2026-110602
libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path
6.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libmspack · kyz
through 0.11alpha · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110602
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110602
patch
https://github.com/kyz/libmspack/commit/4d868504114346aa767d435fbb89a8b76603493f
technical-description
https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/kwajd.c#L111-L181
third-party-advisory
https://hackmd.io/@haind-pwn/libmspack-kwaj-uninitialized-free
third-party-advisory
https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-pointer-free-via-kwajd-open-error-path
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