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

Quick assessment

Affected
kyz libmspack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libmspack 在 0.11alpha 及之前版本中，存在一个未初始化指针释放漏洞，位于 mspack/kwajd.c 文件的 kwajd_open() 函数中。当在读取头信息时发生错误，该函数会释放未清零的文件名和额外指针，导致未定义行为。攻击者可通过构造截断的、空的或签名错误的 KWAJ 文件，触发此漏洞，从而导致进程崩溃或获得任意内存释放类型的内存破坏漏洞。

CVSS 6.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
kyz libmspack ≤ 0.11alpha affected
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I. Basic Information for CVE-2026-110602

Vulnerability Information
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Vulnerability Title
libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用未经初始化的指针
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kyz libmspack 0 ~ 0.11alpha -

II. Public POCs for CVE-2026-110602

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III. Intelligence Information for CVE-2026-110602

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Patches & Fixes for CVE-2026-110602 (1)

Other References for CVE-2026-110602 (3)

IV. Related Vulnerabilities

Same product: libmspack
Same weakness: CWE-824

V. Comments for CVE-2026-110602

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