CVE-2024-3094
Xz: malicious code in distributed source
- Published
- Mar 29, 2024
- Updated
- Aug 4, 2026
- Assigning CNA
- redhat
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through a series of complex obfuscations, the liblzma build process extracts a prebuilt object file from a disguised test file existing in the source code, which is then used to modify specific functions in the liblzma code. This results in a modified liblzma library that can be used by any software linked against this library, intercepting and modifying the data interaction with this library.
Sources
45- xz-cve-2024-3094Research
XZ Backdoor Extract(Test on Ubuntu 23.10)
- xzbotExploit
notes, honeypot, and exploit demo for the xz backdoor (CVE-2024-3094)
- CVE-2024-3094Detection
Shell script to detect if the ssh binary is likely vulnerable to CVE-2024-3094, without requiring hexdump.
Responsible use
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