CVE-2026-119602
libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.
| CWE | CWE-908 |
| Vendor | kyz |
| Product | libmspack |
| Published | Oct 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
kyz / libmspack
0 ≤ 0.11alpha
References
github.com: https://github.com/kyz/libmspack/issues/60 github.com: https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-L276 hackmd.io: https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak github.com: https://github.com/kyz/libmspack vulncheck.com: https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disclosure-via-ms-zip-decompressor-window
Credits
HaiND from the Post and Telecommunication Institute of Technology