CVE-2024-3094Public exploitNetwork attack vector

Pre-authentication code execution via trojanized liblzma build

Published Mar 29, 2024 · Updated Aug 4, 2026

Backdoored liblzma in XZ Utils 5.6.0 and 5.6.1 allows remote attackers to execute code through crafted SSH authentication data. The release-tarball build macro extracts a disguised object, replaces liblzma IFUNC resolvers, and redirects RSA_public_decrypt to attacker-controlled code. Activation requires an x86-64 Linux package build using GCC and GNU ld, plus an sshd integration that reaches liblzma through systemd.

CVSS severity10.0
Critical
EPSS probability85.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Backdoored liblzma in XZ Utils 5.6.0 and 5.6.1 allows remote attackers to execute code through crafted SSH authentication data. The release-tarball build macro extracts a disguised object, replaces liblzma IFUNC resolvers, and redirects RSA_public_decrypt to attacker-controlled code. Activation requires an x86-64 Linux package build using GCC and GNU ld, plus an sshd integration that reaches liblzma through systemd.

The record

CVE
CVE-2024-3094
Published
Mar 29, 2024
Updated
Aug 4, 2026
Vendor
Tukaani Project
Product
XZ Utils
Classifications
CWE-506, T1195.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.6.0
  2. Affected versionversion=5.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tukaani Project · XZ Utilsversion=5.6.0; version=5.6.1

Published CVSS scores

10.0Red Hat, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-506Embedded Malicious Code
T1195.002Compromise Software Supply Chain

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo