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Fencer Vulns
medium 6.3

CVE-2026-110602 json

libmspack through 0.11alpha Uninitialized Pointer Free via kwajd_open Error Path

published 2026-10-14 25 d ago modified 2026-10-16 23 d ago also EUVD-2026-101230

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

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.

Patch / fix

  • libmspack Debian 14 0.11-2

debian advisories DEBIAN-CVE-2026-110602

  • libmspack Ubuntu 22.04 LTS 0.10.1-2ubuntu0.1
  • libmspack Ubuntu 24.04 LTS 0.11-1.1ubuntu0.24.04.1
  • libmspack Ubuntu 26.10 0.11-1.1ubuntu0.26.10.1
  • libmspack Ubuntu 26.04 LTS 0.11-1.1ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-110602

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-110602 updated cvss 6.3

libmspack: libmspack: Memory corruption via uninitialized pointer free in kwajd_open

  • Red Hat Enterprise Linux 7 libmspack, libmspack 0.10.1-0.14.alpha.el10 Red Hat Enterprise Linux 8 libmspack, libmspack 0.10.1-0.14.alpha.el10 Red Hat Enterprise Linux 9 libmspack 0.10.1-0.14.alpha.el10 Red Hat Enterprise Linux 10 libmspack 0.10.1-0.14.alpha.el10 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
25 d ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackmd.io https://hackmd.io/@haind-pwn/libmspack-kwaj-uninitialized-free referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 5.8 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
CNA 3.1 6.3 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
CNA 4.0 5.8 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • kyz libmspack

Classification

Weakness
  • CWE-824 Access of Uninitialized Pointer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.