CVE-2026-110602libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
- Weakness (CWE)
- CWE-824
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
kyz libmspack kyz:libmspack (from the name) | through 0.11alpha | CNA record |
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
- https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-pointer-free-via-kwajd-open-error-paththird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.