CVE-2026-110602

Publication date 14 October 2026

Last updated 3 November 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.3 · Medium

Score breakdown

Description

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
libmspack 26.10 stonking
Fixed in 0.11-1.1ubuntu0.26.10.1
26.04 LTS resolute
Fixed in 0.11-1.1ubuntu0.26.04.1
24.04 LTS noble
Fixed in 0.11-1.1ubuntu0.24.04.1
22.04 LTS jammy
Fixed in 0.10.1-2ubuntu0.1
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation
clamav 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Needs evaluation

Notes

mdeslaur

clamav in xenial+ uses the system libmspack, trusty uses the embedded one.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libmspack

Severity score breakdown

CVSS version:

Base score 5.8 · Medium

Vector: 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

Base score 6.3 · Medium

Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-8973-1
    • libmspack vulnerability
    • 3 November 2026

Other references

Access our resources on patching vulnerabilities