CVE-2024-3094: Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through
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.
Why It Matters
CRITICAL severity with CVSS 10 .
Current Status
- Vulnerability status: Not listed in CISA KEV
- Last intelligence update: 2026-06-17 · source: NVD
Entity Activity Timeline
- 2024-03-29 — NVD publication / disclosure
- 2026-06-17 — Intelligence record updated（NVD sync）
Severity
CRITICAL
CVSS Score: 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source Attribution
Source: NVD · Updated: 2026-06-17T07:43:17.830 · Confidence: high
Impact
Based on CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H — assess confidentiality, integrity, and availability impact via the official vector documentation.
Affected Software
Fix
Upgrade affected software to the fixed version identified above. Apply vendor patches and monitor advisories before exposed systems go unpatched.
Sources & Evidence
- https://access.redhat.com/security/cve/CVE-2024-3094
- https://bugzilla.redhat.com/show_bug.cgi?id=2272210
- https://www.openwall.com/lists/oss-security/2024/03/29/4
- https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users
- http://www.openwall.com/lists/oss-security/2024/03/29/10
- http://www.openwall.com/lists/oss-security/2024/03/29/12
- http://www.openwall.com/lists/oss-security/2024/03/29/4
- http://www.openwall.com/lists/oss-security/2024/03/29/5
- http://www.openwall.com/lists/oss-security/2024/03/29/8
- http://www.openwall.com/lists/oss-security/2024/03/30/12
- http://www.openwall.com/lists/oss-security/2024/03/30/27
- http://www.openwall.com/lists/oss-security/2024/03/30/36
- http://www.openwall.com/lists/oss-security/2024/03/30/5
- http://www.openwall.com/lists/oss-security/2024/04/16/5
- https://access.redhat.com/security/cve/CVE-2024-3094
- https://ariadne.space/2024/04/02/the-xz-utils-backdoor-is-a-symptom-of-a-larger-problem/
- https://arstechnica.com/security/2024/03/backdoor-found-in-widely-used-linux-utility-breaks-encrypted-ssh-connections/
- https://aws.amazon.com/security/security-bulletins/AWS-2024-002/
- https://blog.netbsd.org/tnf/entry/statement_on_backdoor_in_xz
- https://boehs.org/node/everything-i-know-about-the-xz-backdoor
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068024
- https://bugs.gentoo.org/928134
- https://bugzilla.redhat.com/show_bug.cgi?id=2272210
- https://bugzilla.suse.com/show_bug.cgi?id=1222124
- https://discourse.nixos.org/t/cve-2024-3094-malicious-code-in-xz-5-6-0-and-5-6-1-tarballs/42405
- https://gist.github.com/thesamesam/223949d5a074ebc3dce9ee78baad9e27
- https://github.com/advisories/GHSA-rxwq-x6h5-x525
- https://github.com/amlweems/xzbot
- https://github.com/karcherm/xz-malware
- https://gynvael.coldwind.pl/?lang=en&id=782
- https://lists.debian.org/debian-security-announce/2024/msg00057.html
- https://lists.freebsd.org/archives/freebsd-security/2024-March/000248.html
- https://lwn.net/Articles/967180/
- https://news.ycombinator.com/item?id=39865810
- https://news.ycombinator.com/item?id=39877267
- https://news.ycombinator.com/item?id=39895344
- https://openssf.org/blog/2024/03/30/xz-backdoor-cve-2024-3094/
- https://research.swtch.com/xz-script
- https://research.swtch.com/xz-timeline
- https://security-tracker.debian.org/tracker/CVE-2024-3094
- https://security.alpinelinux.org/vuln/CVE-2024-3094
- https://security.archlinux.org/CVE-2024-3094
- https://security.netapp.com/advisory/ntap-20240402-0001/
- https://tukaani.org/xz-backdoor/
- https://twitter.com/LetsDefendIO/status/1774804387417751958
- https://twitter.com/debian/status/1774219194638409898
- https://twitter.com/infosecb/status/1774595540233167206
- https://twitter.com/infosecb/status/1774597228864139400
- https://ubuntu.com/security/CVE-2024-3094
- https://www.binarly.io/blog/persistent-risk-xz-utils-backdoor-still-lurking-in-docker-images
- https://www.cisa.gov/news-events/alerts/2024/03/29/reported-supply-chain-compromise-affecting-xz-utils-data-compression-library-cve-2024-3094
- https://www.darkreading.com/vulnerabilities-threats/are-you-affected-by-the-backdoor-in-xz-utils
- https://www.kali.org/blog/about-the-xz-backdoor/
- https://www.openwall.com/lists/oss-security/2024/03/29/4
- https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users
- https://www.tenable.com/blog/frequently-asked-questions-cve-2024-3094-supply-chain-backdoor-in-xz-utils
- https://www.theregister.com/2024/03/29/malicious_backdoor_xz/
- https://www.vicarius.io/vsociety/vulnerabilities/cve-2024-3094
- https://xeiaso.net/notes/2024/xz-vuln/
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