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Fencer Vulns
critical 10.0

CVE-2024-3094 in the critical feed json

Xz: malicious code in distributed source

published 2024-03-29 2 y ago modified 2026-11-04 4 d ago also EUVD-2024-31700 , JLSEC-2026-62

cvss
10.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
90.9%
EPSS 90.9% chance of exploitation in 30 days, percentile 99.8%
public exploits
0
none known

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.

Patch / fix

  • julia XZ_jll 5.6.3+0
  • tukaani xz 5.6.2
  • xz-utils Debian 14, Debian 13 5.6.1+really5.4.5-1

debian advisories DEBIAN-CVE-2024-3094

  • xz openSUSE Tumbleweed 5.6.2-1.1

opensuse advisories openSUSE-SU-2024:14017-1

  • xz Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 5.6.1-r2
  • lighttpd Alpine 3.18, Alpine 3.17, Alpine 3.16 +1 more 1.4.76-r0

alpine advisories ALPINE-CVE-2024-3094

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • xz Arch Linux 5.6.1-2

arch linux advisories AVG-2851

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-3094 updated cvss 10.0

xz: malicious code in distributed source

  • Red Hat Enterprise Linux 6 xz, xz-libs, xz-lzma-compat Red Hat Enterprise Linux 7 xz, xz-libs, xz-compat-libs, xz-lzma-compat Red Hat Enterprise Linux 8 xz, xz-libs, xz-lzma-compat Red Hat Enterprise Linux 9 xz, xz-libs, xz-lzma-compat Red Hat Enterprise Linux 10 xz Red Hat JBoss Enterprise Application Platform 8 xz
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

90.90% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
OSV 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
julia XZ_jll
>=5.6.0+0, <5.6.3+0
5.6.3+0

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat JBoss Enterprise Application Platform 8

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.