CVE-2026-54550

HIGHPre-NVD 7.47.4
EchelonGraph scoreMEDIUM confidence

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

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-08-26. A secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
7.4EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.4Exploit: No code on recordExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

IzPack is a widely used tool for packaging applications on the Java platform as cross-platform installers. In 5.2.6 and earlier, UnpackerBase.unpack() in izpack-installer/src/main/java/com/izforge/izpack/installer/unpacker/UnpackerBase.java obtains an attacker-controlled PackFile targetPath, passes it through IoHelper.translatePath(), which only converts separators, and constructs a File without normalizing parent-directory segments or enforcing destination containment. A malicious installer pack entry containing ../ sequences can therefore write outside the intended installation directory to startup folders, executable search paths, or other locations accessible with the victim's privileges when the victim runs the installer.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity74% × 45%
The EG Score, 7.4 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

August 26, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 26, 2026
No fix on record yet. Sources: github_commit, github, github_pr.
GitHub commit

commit 8b7c6792c4fe (izpack/izpack)

Fix landed in izpack/izpack commit 8b7c6792c4fe — awaiting tagged release

https://github.com/izpack/izpack/commit/8b7c6792c4fe85e3b1759c106aae39b904848466
GitHub commit

commit 4233ba38d0f1 (izpack/izpack)

Fix landed in izpack/izpack commit 4233ba38d0f1 — awaiting tagged release

https://github.com/izpack/izpack/commit/4233ba38d0f1825f9cf3e0204e5261a5498e29d8
GitHub pull request

Backport IZPACK-1820

Fix merged in izpack/izpack PR #1193 on 2026-07-17 — awaiting tagged release

https://github.com/izpack/izpack/pull/1193
GitHub advisoryMentions a patch (unverified)

Path Traversal in UnpackerBase allows writing files outside the installation directory via malicious pack entries · Advisory · izpack/izpack · GitHub

https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9

Vendor Advisories for CVE-2026-54550(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
mavenorg.codehaus.izpack:izpack-installer—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.codehaus.izpack:izpack-installer5.0.0 ... 5.2.6 (44 versions)
  • every version through 5.2.6: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 99× 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 100 of 172 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. None are among the latest 100 rows. The 72 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  9. 2026-10-10 06:34 UTCEG score recompute
  10. 2026-10-10 06:34 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  12. 2026-10-09 03:26 UTCEG score recompute
  13. 2026-10-09 03:26 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  14. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  15. 2026-10-08 01:56 UTCEG score recompute
  16. 2026-10-08 01:56 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  18. 2026-10-07 05:01 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  19. 2026-10-06 15:58 UTCEG score recompute
  20. 2026-10-06 15:58 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  22. 2026-10-06 01:43 UTCEG score recompute
  23. 2026-10-06 01:43 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  24. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  25. 2026-10-05 08:44 UTCEG score recompute
Show 75 more
  1. 2026-10-05 08:44 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  2. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  3. 2026-10-04 19:42 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  4. 2026-10-04 05:10 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  5. 2026-10-03 16:09 UTCEG score recompute
  6. 2026-10-03 16:09 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  7. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  8. 2026-10-03 01:52 UTCEG score recompute
  9. 2026-10-03 01:52 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  10. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  11. 2026-10-02 12:51 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  12. 2026-10-01 22:38 UTCEG score recompute
  13. 2026-10-01 22:38 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 36th percentile
  15. 2026-10-01 09:00 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  16. 2026-09-30 19:59 UTCEG score recompute
  17. 2026-09-30 19:59 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 36th percentile
  19. 2026-09-30 06:08 UTCEG score recompute
  20. 2026-09-30 06:08 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 36th percentile
  22. 2026-09-29 14:32 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  23. 2026-09-29 01:25 UTCEG score recompute
  24. 2026-09-29 01:25 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 36th percentile
  26. 2026-09-28 12:13 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  27. 2026-09-27 23:12 UTCEG score recompute
  28. 2026-09-27 23:12 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  29. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 36th percentile
  30. 2026-09-27 10:10 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  31. 2026-09-26 21:08 UTCEG score recompute
  32. 2026-09-26 21:08 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  33. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 36th percentile
  34. 2026-09-25 15:49 UTCEG score recompute
  35. 2026-09-25 15:49 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  36. 2026-09-25 02:48 UTCEG score recompute
  37. 2026-09-25 02:48 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  38. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 36th percentile
  39. 2026-09-24 13:46 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  40. 2026-09-24 00:45 UTCEG score recompute
  41. 2026-09-24 00:45 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  42. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  43. 2026-09-23 11:43 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  44. 2026-09-22 22:42 UTCEG score recompute
  45. 2026-09-22 22:42 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  46. 2026-09-22 09:41 UTCEG score recompute
  47. 2026-09-22 09:41 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  48. 2026-09-21 20:38 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  49. 2026-09-21 07:36 UTCEG score recompute
  50. 2026-09-21 07:36 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  51. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  52. 2026-09-20 18:30 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  53. 2026-09-20 05:29 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  54. 2026-09-19 16:26 UTCEG score recompute
  55. 2026-09-19 16:26 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  56. 2026-09-19 03:24 UTCEG score recompute
  57. 2026-09-19 03:24 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  58. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  59. 2026-09-18 14:23 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  60. 2026-09-18 01:06 UTCEG score recompute
  61. 2026-09-18 01:06 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  62. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  63. 2026-09-17 12:05 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  64. 2026-09-16 23:04 UTCEG score recompute
  65. 2026-09-16 23:03 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  66. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  67. 2026-09-16 10:01 UTCEG score recompute
  68. 2026-09-16 10:01 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  69. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  70. 2026-09-15 20:59 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  71. 2026-09-15 07:56 UTCEG score recompute
  72. 2026-09-15 07:56 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  73. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  74. 2026-09-14 18:54 UTCGHSA enrichmentGHSA-f63g-88cj-hjf9 · GitHub severity HIGH · GitHub CVSS 7.4
  75. 2026-09-14 05:27 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54550?
CVE-2026-54550 is a high-severity vulnerability; its CVE record was published on August 26, 2026. IzPack is a widely used tool for packaging applications on the Java platform as cross-platform installers. In 5.2.6 and earlier, UnpackerBase.unpack() in izpack-installer/src/main/java/com/izforge/izpack/installer/unpacker/UnpackerBase.java obtains an attacker-controlled PackFile targetPath, passes…
When was the CVE record for CVE-2026-54550 published?
The CVE record for CVE-2026-54550 was published on August 26, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-54550 actively exploited?
CVE-2026-54550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54550?
CVE-2026-54550 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54550?
No fix for CVE-2026-54550 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-54550 are linked in the Vendor Advisories panel on this page.

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