CVE-2024-3094

10.0 criticalEPSS 91%

Critical (10.0) in tukaani xz. EPSS 91% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

10.0 critical

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

EPSS: 91% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CWE: CWE-506
Published: 2024-03-29
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

tukaani:xz

References

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

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