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NIST has updated the NVD program announcement page with additional information regarding recent concerns and the temporary delays in enrichment efforts.

CVE-2024-3094 Detail


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.


CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  Red Hat, Inc.
Base Score:  10.0 CRITICAL
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.

Hyperlink Resource
https://access.redhat.com/security/cve/CVE-2024-3094 Vendor Advisory 
https://arstechnica.com/security/2024/03/backdoor-found-in-widely-used-linux-utility-breaks-encrypted-ssh-connections/ Third Party Advisory 
https://aws.amazon.com/security/security-bulletins/AWS-2024-002/ Third Party Advisory 
https://boehs.org/node/everything-i-know-about-the-xz-backdoor Third Party Advisory 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1068024 Mailing List  Vendor Advisory 
https://bugs.gentoo.org/928134 Issue Tracking  Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2272210 Issue Tracking  Vendor Advisory 
https://bugzilla.suse.com/show_bug.cgi?id=1222124 Issue Tracking  Third Party Advisory 
https://discourse.nixos.org/t/cve-2024-3094-malicious-code-in-xz-5-6-0-and-5-6-1-tarballs/42405 Third Party Advisory 
https://gist.github.com/thesamesam/223949d5a074ebc3dce9ee78baad9e27 Third Party Advisory 
https://github.com/advisories/GHSA-rxwq-x6h5-x525 Third Party Advisory 
https://github.com/karcherm/xz-malware Third Party Advisory 
https://gynvael.coldwind.pl/?lang=en&id=782 Technical Description  Third Party Advisory 
https://lists.debian.org/debian-security-announce/2024/msg00057.html Mailing List  Third Party Advisory 
https://lists.freebsd.org/archives/freebsd-security/2024-March/000248.html Third Party Advisory 
https://lwn.net/Articles/967180/ Issue Tracking  Third Party Advisory 
https://news.ycombinator.com/item?id=39865810 Issue Tracking  Third Party Advisory 
https://news.ycombinator.com/item?id=39877267 Issue Tracking 
https://openssf.org/blog/2024/03/30/xz-backdoor-cve-2024-3094/ Third Party Advisory 
https://security-tracker.debian.org/tracker/CVE-2024-3094 Third Party Advisory 
https://security.alpinelinux.org/vuln/CVE-2024-3094 Third Party Advisory 
https://security.archlinux.org/CVE-2024-3094 Third Party Advisory 
https://tukaani.org/xz-backdoor/ Issue Tracking  Vendor Advisory 
https://twitter.com/LetsDefendIO/status/1774804387417751958 Third Party Advisory 
https://twitter.com/debian/status/1774219194638409898 Press/Media Coverage 
https://twitter.com/infosecb/status/1774595540233167206 Press/Media Coverage 
https://twitter.com/infosecb/status/1774597228864139400 Press/Media Coverage 
https://ubuntu.com/security/CVE-2024-3094 Third Party Advisory 
https://www.cisa.gov/news-events/alerts/2024/03/29/reported-supply-chain-compromise-affecting-xz-utils-data-compression-library-cve-2024-3094 Third Party Advisory  US Government Resource 
https://www.darkreading.com/vulnerabilities-threats/are-you-affected-by-the-backdoor-in-xz-utils Third Party Advisory 
https://www.openwall.com/lists/oss-security/2024/03/29/4 Mailing List 
https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users Vendor Advisory 
https://www.tenable.com/blog/frequently-asked-questions-cve-2024-3094-supply-chain-backdoor-in-xz-utils Third Party Advisory 
https://www.theregister.com/2024/03/29/malicious_backdoor_xz/ Press/Media Coverage 
https://xeiaso.net/notes/2024/xz-vuln/ Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-506 Embedded Malicious Code Provider acceptance level Red Hat, Inc.  

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Change History

13 change records found show changes

Quick Info

CVE Dictionary Entry:
NVD Published Date:
NVD Last Modified:
Red Hat, Inc.