CVE-2024-3094

CRITICAL 89 PoCs
ACT NOW Priority: 9.09 BB Relevance: 100/100
Published: 2024-03-29 Modified: 2026-11-04 First seen: 2026-11-04 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact Scope Change

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Changed
C: High
I: High
A: High

Description

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.

Weakness Classification (1)

Affected Software (4)

VendorProductVersion
— — 5.6.0
— — 5.6.1
tukaani xz 5.6.0
tukaani xz 5.6.1

References & Advisories (55)

https://bugzilla.redhat.com/show_bug.cgi?id=2272210
issue-tracking x_refsource_REDHAT
https://gynvael.coldwind.pl/?lang=en&id=782
Technical Description Third Party Advisory
Showing 25 of 55 references

Proof of Concept (89)

Bug Bounty Relevance

100 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction
✓ PoC available (89)
✓ High exploitation probability

CVSS Score

10.0 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploitation Probability

90.90%
Raw Score 0.909000
Percentile 99.8%
Date 2026-11-13

EPSS Trend

2026-11-13
0.90900
2026-11-12
0.90900
2026-11-10
0.90900
2026-11-09
0.90900
2026-11-08
0.90900
2026-11-07
0.90900
2026-11-06
0.90900
2026-11-05
0.90900
2026-11-04
0.90900

Intelligence Sources

mitre ref →
nvd ref →