MEDIUM 6.3 NVD
CVE-2026-119602
libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unc
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.
References
- https://github.com/kyz/libmspack
- https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-L276
- https://github.com/kyz/libmspack/issues/60
- https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak
- https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disc
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-10-30 via NVD.
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