{"id":"CVE-2026-101894","aliases":["GHSA-hrh2-vp3x-79xf"],"url":"https://o3.security/vulnerability/CVE-2026-101894","summary":"@xhmikosr/decompress: Path traversal via symlink chain","details":"### Impact\n\nWhen extracting an untrusted archive with the default `decompress(input, output)` API, a crafted archive containing a chain of symlink entries can make a later entry resolve **outside** the output directory. The lexical containment checks pass, but the kernel follows the planted symlinks to a path outside `output`, letting an attacker write (and read) files outside the intended extraction directory. Overwriting startup scripts or configuration can lead to remote code execution.\n\nThis is a bypass of the hardening in GHSA-mp2f-45pm-3cg9. Any application that extracts attacker-controlled archives is affected.\n\n### Patches\n\nFixed in **11.1.4** (`latest`) and backported to **10.2.2** (`release-v10` dist-tag). Upgrade to one of these.\n\nThe unmaintained upstream `decompress` package shares this flaw and will not be patched. Migrate to `@xhmikosr/decompress@11.1.4` (or `@10.2.2`).\n\n### Workarounds\n\nNone. Do not extract untrusted archives on affected versions. If you cannot upgrade, validate entries out of band and reject any whose resolved path escapes the target directory.","published":"2026-09-28T16:57:11.440Z","modified":"2026-10-21T02:52:26.864703822Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"@xhmikosr/decompress","fixedVersion":"11.1.4"},{"ecosystem":"npm","name":"@xhmikosr/decompress","fixedVersion":"10.2.2"},{"ecosystem":"npm","name":"decompress","fixedVersion":null}],"fix":{"url":"https://github.com/XhmikosR/decompress/commit/5f4b2f64abb31bbaf1fef8975b595fd7df2558d8","label":"XhmikosR/decompress@5f4b2f6"},"references":[{"type":"WEB","url":"https://github.com/XhmikosR/decompress/releases/tag/v10.2.2"},{"type":"WEB","url":"https://github.com/XhmikosR/decompress/releases/tag/v11.1.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101894.json"},{"type":"ADVISORY","url":"https://github.com/XhmikosR/decompress/security/advisories/GHSA-hrh2-vp3x-79xf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101894"},{"type":"FIX","url":"https://github.com/XhmikosR/decompress/commit/5f4b2f64abb31bbaf1fef8975b595fd7df2558d8"},{"type":"FIX","url":"https://github.com/XhmikosR/decompress/commit/f6c88c668216d6a12c6cecf4fe0b6c70bf77050a"},{"type":"PACKAGE","url":"https://github.com/XhmikosR/decompress"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:52:26.864703822Z"}}