{"id":"CVE-2026-54550","state":"PUBLISHED","title":"IzPack: Path Traversal in UnpackerBase allows writing files outside the installation directory via malicious pack entries","description":"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.","publishedAt":"2026-08-26T14:24:06.879Z","updatedAt":"2026-08-26T15:37:00.917Z","severity":{"score":7.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["izpack izpack"],"affected":[{"vendor":"izpack","product":"izpack","versions":[{"version":"<= 5.2.6","status":"affected"}]}],"references":["https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9","https://github.com/izpack/izpack/pull/1193","https://github.com/izpack/izpack/commit/4233ba38d0f1825f9cf3e0204e5261a5498e29d8","https://github.com/izpack/izpack/commit/8b7c6792c4fe85e3b1759c106aae39b904848466"],"weaknesses":["CWE-22"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54550.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54550","state":"PUBLISHED","datePublished":"2026-08-26T14:24:06.879Z","dateUpdated":"2026-08-26T15:37:00.917Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T19:04:14.456Z"},"containers":{"cna":{"title":"IzPack: Path Traversal in UnpackerBase allows writing files outside the installation directory via malicious pack entries","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"izpack","product":"izpack","versions":[{"version":"<= 5.2.6","status":"affected"}]}],"references":[{"url":"https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9","name":"https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/izpack/izpack/pull/1193","name":"https://github.com/izpack/izpack/pull/1193","tags":["x_refsource_MISC"]},{"url":"https://github.com/izpack/izpack/commit/4233ba38d0f1825f9cf3e0204e5261a5498e29d8","name":"https://github.com/izpack/izpack/commit/4233ba38d0f1825f9cf3e0204e5261a5498e29d8","tags":["x_refsource_MISC"]},{"url":"https://github.com/izpack/izpack/commit/8b7c6792c4fe85e3b1759c106aae39b904848466","name":"https://github.com/izpack/izpack/commit/8b7c6792c4fe85e3b1759c106aae39b904848466","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-26T14:24:06.879Z"},"source":{"advisory":"GHSA-f63g-88cj-hjf9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-26T15:36:54.267935Z","id":"CVE-2026-54550","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-26T15:37:00.917Z"}}]}}}