CVE-2026-54550

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

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, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: Elevated riskExposed: 0

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

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
7.4(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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
Severity74% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

August 26, 2026

Last Modified

August 26, 2026

Advisory Details (4)

Auto-updated Aug 26, 2026
🔬 Proof of concept available. Patch available. 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_pr

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 Patch Available🟡 PoC Available

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 / EcosystemFixed in / 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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 19× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-08-30 02:04 UTCEG score recompute
  2. 2026-08-30 02:04 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 13:02 UTCGHSA enrichment
  5. 2026-08-28 23:58 UTCEG score recompute
  6. 2026-08-28 23:58 UTCGHSA enrichment
  7. 2026-08-28 21:41 UTCEPSS rescore
  8. 2026-08-28 07:40 UTCGHSA enrichment
  9. 2026-08-27 18:31 UTCEG score recompute
  10. 2026-08-27 18:31 UTCGHSA enrichment
  11. 2026-08-27 14:25 UTCEPSS rescore
  12. 2026-08-27 05:26 UTCEG score recompute
  13. 2026-08-27 05:25 UTCGHSA enrichment
  14. 2026-08-26 16:21 UTCEG score recompute
  15. 2026-08-26 16:21 UTCGHSA enrichment
  16. 2026-08-26 15:48 UTCEG score recompute
  17. 2026-08-26 15:48 UTCGHSA enrichment
  18. 2026-08-26 14:37 UTCEG score recompute
  19. 2026-08-26 14:37 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54550?
CVE-2026-54550 is a high vulnerability 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 CVE-2026-54550 disclosed?
CVE-2026-54550 was first published in the National Vulnerability Database on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54550 actively exploited?
CVE-2026-54550 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.5% of all scored CVEs.
What is the CVSS score of CVE-2026-54550?
CVE-2026-54550 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-54550?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54550, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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