CVE-2026-110602: Access of Uninitialized Pointer in kyz libmspack
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 v4.0
Score 5.8medium
Affected software
kyz
libmspack
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in libmspack (<=0.11alpha) is due to an uninitialized pointer free in the kwajd_open() function located in mspack/kwajd.c. When the function encounters header read errors, it frees filename and extra pointers that have not been zeroed, leading to use-after-free or arbitrary free conditions. Attackers can exploit this by providing truncated, empty, or incorrectly signed KWAJ archive files, potentially causing a crash or enabling memory corruption primitives.
Potential Impact
Exploitation can lead to denial of service via process crashes or potentially arbitrary memory corruption, which may be leveraged for further attacks. The CVSS 4.0 score is 5.8 (medium), reflecting local attack vector with low complexity, requiring user interaction, and no privileges needed.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor vendor communications for updates and avoid processing untrusted KWAJ files until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-14T13:07:20.909Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acf92eb2cdf04f6568a3825
Added to database: 10/14/2026, 14:34:19 UTC
Last enriched: 10/14/2026, 15:18:37 UTC
Last updated: 10/14/2026, 19:00:29 UTC
Views: 9
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