CVE-2026-110602: medium-severity vulnerability in kyz libmspack
libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.8epss 0.2%
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:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
kyz · libmspackRelated CVEs — kyz libmspack
In the same product, most dangerous first.
References
https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/kwajd.c#L111-L181https://github.com/kyz/libmspack/commit/4d868504114346aa767d435fbb89a8b76603493fhttps://hackmd.io/@haind-pwn/libmspack-kwaj-uninitialized-freehttps://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-pointer-free-via-kwajd-open-error-path