CVE-2024-3094

CRITICALNVD 10.010.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2024-03-29. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this weekElevated

Also known asEUVD-2024-31700 (ENISA EUVD) · GHSA-rxwq-x6h5-x525 (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High exploitation likelihood — EPSS 91%
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 91%CVSS: 10.0Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

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 v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
96
EG Risk 96/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation91% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
91%
EPSS %ILE
99th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
91% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 29, 2024

Last Modified

August 4, 2026

Advisory Details (10)

Auto-updated Oct 27, 2026
Patch available. Sources: redhat.
Web page

Urgent security alert for Fedora 40 and Fedora Rawhide users

https://www.redhat.com/en/blog/urgent-security-alert-fedora-41-and-rawhide-users
Web page

oss-security - backdoor in upstream xz/liblzma leading to ssh server compromise

https://www.openwall.com/lists/oss-security/2024/03/29/4
Red Hat

2272210 – (CVE-2024-3094) CVE-2024-3094 xz: malicious code in distributed source

https://bugzilla.redhat.com/show_bug.cgi?id=2272210
Red HatMentions a patch (unverified)

CVE-2024-3094 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2024-3094
Web page

oss-security - Re: backdoor in upstream xz/liblzma leading to ssh server compromise

http://www.openwall.com/lists/oss-security/2024/03/30/12
Web page

oss-security - Re: backdoor in upstream xz/liblzma leading to ssh server compromise

http://www.openwall.com/lists/oss-security/2024/03/29/8
Web page

oss-security - Re: backdoor in upstream xz/liblzma leading to ssh server compromise

http://www.openwall.com/lists/oss-security/2024/03/29/5
Web page

oss-security - backdoor in upstream xz/liblzma leading to ssh server compromise

http://www.openwall.com/lists/oss-security/2024/03/29/4
Web page

oss-security - Re: backdoor in upstream xz/liblzma leading to ssh server compromise

http://www.openwall.com/lists/oss-security/2024/03/29/12
Web page

oss-security - Re: backdoor in upstream xz/liblzma leading to ssh server compromise

http://www.openwall.com/lists/oss-security/2024/03/29/10

Vendor Advisories for CVE-2024-3094(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(11 across 11 ecosystems)
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
lighttpd—
  • every version up to 1.4.76-r0: fixed in 1.4.76-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
lighttpd—
  • every version up to 1.4.76-r0: fixed in 1.4.76-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
lighttpd—
  • every version up to 1.4.76-r0: fixed in 1.4.76-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
lighttpd—
  • every version up to 1.4.76-r0: fixed in 1.4.76-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
xz—
  • every version up to 5.6.1-r2: fixed in 5.6.1-r2
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
xz—
  • every version up to 5.6.1-r2: fixed in 5.6.1-r2
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
xz—
  • every version up to 5.6.1-r2: fixed in 5.6.1-r2
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
xz—
  • every version up to 5.6.1-r2: fixed in 5.6.1-r2
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
xz—
  • every version up to 5.6.1-r2: fixed in 5.6.1-r2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
xz-utils—
  • every version up to 5.6.1+really5.4.5-1: fixed in 5.6.1+really5.4.5-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
xz-utils—
  • every version up to 5.6.1+really5.4.5-1: fixed in 5.6.1+really5.4.5-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 18× in last 7d / 57× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 127 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 12:36 UTCEG score recompute
  2. 2026-11-02 12:35 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-11-01 12:58 UTCEG score recompute
  4. 2026-11-01 12:58 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  5. 2026-10-31 13:21 UTCEG score recompute
  6. 2026-10-31 13:21 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  7. 2026-10-30 13:44 UTCEG score recompute
  8. 2026-10-30 13:44 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-10-29 16:30 UTCEPSS rescoreEPSS 91% · 99th percentile
  10. 2026-10-29 13:52 UTCEG score recompute
  11. 2026-10-29 13:52 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  12. 2026-10-28 14:15 UTCEG score recompute
  13. 2026-10-28 14:14 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  14. 2026-10-27 16:29 UTCEPSS rescoreEPSS 91% · 99th percentile
  15. 2026-10-27 14:18 UTCEG score recompute
  16. 2026-10-27 14:18 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  17. 2026-10-26 14:19 UTCEG score recompute
  18. 2026-10-26 14:19 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  19. 2026-10-25 16:30 UTCEPSS rescoreEPSS 91% · 99th percentile
  20. 2026-10-25 14:11 UTCEG score recompute
  21. 2026-10-25 14:11 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  22. 2026-10-24 14:34 UTCEG score recompute
  23. 2026-10-24 14:34 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  24. 2026-10-23 14:57 UTCEG score recompute
  25. 2026-10-23 14:57 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
Show 71 more
  1. 2026-10-22 16:31 UTCEPSS rescoreEPSS 91% · 99th percentile
  2. 2026-10-22 15:19 UTCEG score recompute
  3. 2026-10-22 15:18 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  4. 2026-10-21 15:38 UTCEG score recompute
  5. 2026-10-21 15:38 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-10-20 16:30 UTCEPSS rescoreEPSS 91% · 99th percentile
  7. 2026-10-20 16:01 UTCEG score recompute
  8. 2026-10-20 16:01 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-10-19 16:23 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  10. 2026-10-18 16:43 UTCEG score recompute
  11. 2026-10-18 16:43 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  12. 2026-10-18 07:18 UTCEG score recompute
  13. 2026-10-17 23:40 UTCEG score recompute
  14. 2026-10-17 23:40 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  15. 2026-10-17 00:03 UTCEG score recompute
  16. 2026-10-17 00:03 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  17. 2026-10-16 16:36 UTCEPSS rescoreEPSS 91% · 99th percentile
  18. 2026-10-15 20:57 UTCEG score recompute
  19. 2026-10-15 20:56 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  20. 2026-10-14 16:30 UTCEPSS rescoreEPSS 90% · 99th percentile
  21. 2026-10-14 15:04 UTCEG score recompute
  22. 2026-10-14 15:03 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  23. 2026-10-13 16:30 UTCEPSS rescoreEPSS 90% · 99th percentile
  24. 2026-10-13 14:25 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  25. 2026-10-12 17:56 UTCEG score recompute
  26. 2026-10-12 14:27 UTCEG score recompute
  27. 2026-10-12 14:27 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  28. 2026-10-11 21:20 UTCEG score recompute
  29. 2026-10-11 16:14 UTCEG score recompute
  30. 2026-10-10 19:58 UTCEPSS rescoreEPSS 86% · 99th percentile
  31. 2026-10-07 23:46 UTCEPSS rescoreEPSS 86% · 99th percentile
  32. 2026-10-03 14:24 UTCEPSS rescoreEPSS 86% · 99th percentile
  33. 2026-09-30 19:42 UTCEG score recompute
  34. 2026-09-26 15:57 UTCEPSS rescoreEPSS 86% · 99th percentile
  35. 2026-09-26 00:23 UTCEPSS rescoreEPSS 86% · 99th percentile
  36. 2026-09-25 08:06 UTCOSV refresh
  37. 2026-09-24 14:01 UTCEPSS rescoreEPSS 86% · 99th percentile
  38. 2026-09-22 14:46 UTCEPSS rescoreEPSS 86% · 99th percentile
  39. 2026-09-21 20:32 UTCEPSS rescoreEPSS 86% · 99th percentile
  40. 2026-09-18 19:26 UTCEPSS rescoreEPSS 86% · 99th percentile
  41. 2026-09-16 14:06 UTCEPSS rescoreEPSS 86% · 99th percentile
  42. 2026-09-07 15:59 UTCEPSS rescoreEPSS 86% · 99th percentile
  43. 2026-09-06 13:46 UTCEPSS rescoreEPSS 86% · 99th percentile
  44. 2026-09-05 23:51 UTCOSV refresh
  45. 2026-09-05 15:26 UTCEPSS rescoreEPSS 86% · 99th percentile
  46. 2026-09-04 05:05 UTCEPSS rescoreEPSS 86% · 99th percentile
  47. 2026-08-30 19:15 UTCEPSS rescoreEPSS 86% · 99th percentile
  48. 2026-08-28 21:39 UTCEPSS rescoreEPSS 86% · 99th percentile
  49. 2026-08-26 14:44 UTCEPSS rescoreEPSS 86% · 99th percentile
  50. 2026-08-24 14:15 UTCEPSS rescoreEPSS 86% · 99th percentile
  51. 2026-08-20 22:53 UTCEPSS rescoreEPSS 86% · 99th percentile
  52. 2026-08-19 10:59 UTCOSV refresh
  53. 2026-08-18 13:46 UTCEPSS rescoreEPSS 86% · 99th percentile
  54. 2026-08-13 21:59 UTCEPSS rescoreEPSS 86% · 99th percentile
  55. 2026-08-11 13:40 UTCEPSS rescoreEPSS 86% · 99th percentile
  56. 2026-08-04 15:08 UTCEPSS rescoreEPSS 86% · 99th percentile
  57. 2026-08-04 06:38 UTCEG score recompute
  58. 2026-08-04 06:37 UTCGHSA enrichmentGHSA-rxwq-x6h5-x525 · GitHub severity CRITICAL · GitHub CVSS 10.0
  59. 2026-07-30 12:14 UTCOSV refresh
  60. 2026-07-24 14:16 UTCEPSS rescoreEPSS 86% · 99th percentile
  61. 2026-07-23 02:36 UTCEG score recompute
  62. 2026-07-22 14:07 UTCEPSS rescoreEPSS 86% · 99th percentile
  63. 2026-07-20 17:06 UTCEPSS rescoreEPSS 86% · 99th percentile
  64. 2026-07-15 16:56 UTCEPSS rescoreEPSS 86% · 99th percentile
  65. 2026-07-13 22:29 UTCEPSS rescoreEPSS 86% · 99th percentile
  66. 2026-07-12 21:37 UTCOSV refresh
  67. 2026-07-12 05:45 UTCEPSS rescoreEPSS 86% · 99th percentile
  68. 2026-07-06 02:22 UTCEPSS rescoreEPSS 86% · 99th percentile
  69. 2026-07-01 15:05 UTCEPSS rescoreEPSS 86% · 99th percentile
  70. 2026-06-25 13:49 UTCEPSS rescoreEPSS 86% · 99th percentile
  71. 2026-06-24 07:20 UTCOSV refresh

Publicly available exploits

(13 references, 10 shown)

Public exploit code is referenced for this CVE (10 GitHub PoCs), as are 3 GitHub checker repositories. A GitHub repository named or described as a checker or scanner checks whether a system is affected; it is not necessarily exploit code. Defenders should treat patch urgency accordingly.

  • GitHub PoCamlweems/xzbot✓ verified
    Published Apr 2, 2024

    Reverse-engineered honeypot + reproduction harness for the xz-utils backdoor.

    Open source ↗
  • GitHub PoCrobertdfrench/ifuncd-up
    Published Jul 5, 2024

    GNU IFUNC is the real culprit behind CVE-2024-3094

    Open source ↗
  • GitHub PoCr0binak/xzk8s
    Published Apr 2, 2024

    Dockerfile and Kubernetes manifests for reproduce CVE-2024-3094

    Open source ↗
  • GitHub PoC0xlane/xz-cve-2024-3094
    Published Apr 1, 2024

    XZ Backdoor Extract(Test on Ubuntu 23.10)

    Open source ↗
  • GitHub PoCjfrog/cve-2024-3094-tools
    Published Mar 31, 2024
    Open source ↗
  • GitHub checkerteyhouse/CVE-2024-3094
    Published Mar 30, 2024

    K8S and Docker Vulnerability Check for CVE-2024-3094

    Open source ↗
  • GitHub checkerwgetnz/CVE-2024-3094-check
    Published Mar 30, 2024
    Open source ↗
  • GitHub PoCemirkmo/xz-backdoor-github
    Published Mar 30, 2024

    History of commits related to the xz backdoor Discovered On March 29, 2024: CVE-2024-3094.

    Open source ↗
  • GitHub PoCgensecaihq/CVE-2024-3094-Vulnerability-Checker-Fixer
    Published Mar 30, 2024

    Shell scripts to identify and fix installations of xz-utils affected by the CVE-2024-3094 vulnerability. Versions 5.6.0 and 5.6.1 of xz-utils are known to be vulnerable, and this script aids in detecting them and optionally downgrading to a stable, un-compromised version (5.4.6) or upgrading to latest version. Added Ansible Playbook

    Open source ↗
  • GitHub PoClockness-Ko/xz-vulnerable-honeypot
    Published Mar 30, 2024

    An ssh honeypot with the XZ backdoor. CVE-2024-3094

    Open source ↗

Past incidents using this CVE

(1)

This CVE was central to one or more publicly-documented breaches. Each card links to authoritative reporting at the time of the incident.

  • xz-utils backdoorMar 2024

    Multi-year social-engineering attack inserted a backdoor into xz-utils, used by sshd via systemd. Caught accidentally by a Microsoft engineer before reaching stable Debian/Ubuntu. Closest call in OSS supply-chain history.

    Source: Ars Technica

Frequently asked(5)

What is CVE-2024-3094?
CVE-2024-3094 is a critical-severity vulnerability; its CVE record was published on March 29, 2024. 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…
When was CVE-2024-3094 made public?
CVE-2024-3094 was made public on March 29, 2024: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on March 29, 2024. EchelonGraph's copy of the record carries a last-modified date of August 4, 2026; the record at its source may have been updated since.
Is CVE-2024-3094 actively exploited?
CVE-2024-3094 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2024-3094?
CVE-2024-3094 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2024-3094?
A fix for CVE-2024-3094 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2024-3094 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-3094

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