CVE-2026-110602
libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path
- State
- Published
- Severity
- 5.8 Medium
- Published
- Oct 14, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.8 Medium | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.3 Medium | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H | VulnCheck |
Weaknesses
- CWE-824 Access of Uninitialized Pointer
Affected Products
| Product | Versions |
|---|---|
libmspackkyz |
|
References
- https://github.com/kyz/libmspack/commit/4d868504114346aa767d435fbb89a8b76603493fpatch
- https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/kwajd.c#L111-L181technical-description
- https://hackmd.io/@haind-pwn/libmspack-kwaj-uninitialized-freethird-party-advisory
- VulnCheck Advisory: libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Paththird-party-advisory
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