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GHSA-HRH2-VP3X-79XF

Vulnerability from github – Published: 2026-09-29 23:49 – Updated: 2026-09-29 23:49

Summary

@xhmikosr/decompress: Path traversal via symlink chain

Details

Impact

When 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.

This is a bypass of the hardening in GHSA-mp2f-45pm-3cg9. Any application that extracts attacker-controlled archives is affected.

Patches

Fixed in 11.1.4 (latest) and backported to 10.2.2 (release-v10 dist-tag). Upgrade to one of these.

The unmaintained upstream decompress package shares this flaw and will not be patched. Migrate to @xhmikosr/decompress@11.1.4 (or @10.2.2).

Workarounds

None. 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.

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 11.1.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@xhmikosr/decompress"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0"
            },
            {
              "fixed": "11.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 10.2.1"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@xhmikosr/decompress"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "10.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "decompress"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "4.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-101894"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-29T23:49:42Z",
    "nvd_published_at": "2026-09-28T17:17:48Z",
    "severity": "CRITICAL"
  },
  "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.",
  "id": "GHSA-hrh2-vp3x-79xf",
  "modified": "2026-09-29T23:49:42Z",
  "published": "2026-09-29T23:49:42Z",
  "references": [
    {
      "type": "WEB",
      "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": "WEB",
      "url": "https://github.com/XhmikosR/decompress/commit/5f4b2f64abb31bbaf1fef8975b595fd7df2558d8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/XhmikosR/decompress/commit/f6c88c668216d6a12c6cecf4fe0b6c70bf77050a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/XhmikosR/decompress"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@xhmikosr/decompress: Path traversal via symlink chain"
}

CVE-2026-101894 (GCVE-0-2026-101894)

Vulnerability from cvelistv5 – Published: 2026-09-28 16:57 – Updated: 2026-09-28 17:39

Title

@xhmikosr/decompress: Path traversal via symlink chain

Summary

The decompress package for Node.js extracts archives. Prior to 10.2.2 and 11.1.4, the default decompress(input, output) API relies on lexical containment checks that do not account for the kernel following a planted symlink chain. An attacker can supply a crafted archive containing chained symlink entries so that a later entry resolves outside the output directory. This allows files outside output to be read or written, and overwriting startup scripts or configuration can lead to remote code execution. The maintained @xhmikosr/decompress package is fixed in 10.2.2 and 11.1.4, but the separately affected unmaintained decompress package remains unpatched through 4.2.1. This vulnerability results from a bypass of the incomplete hardening for CVE-2026-53486. @xhmikosr/decompress is fixed in versions 10.2.2 and 11.1.4.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-28 17:38 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

GitHub_M mitre root Scorecard

References

5 references

URL	Tags
https://github.com/XhmikosR/decompress/security/a…	x_refsource_CONFIRM
https://github.com/XhmikosR/decompress/commit/5f4…	x_refsource_MISC
https://github.com/XhmikosR/decompress/commit/f6c…	x_refsource_MISC
https://github.com/XhmikosR/decompress/releases/t…	x_refsource_MISC
https://github.com/XhmikosR/decompress/releases/t…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version
XhmikosR	decompress	Affected: < 10.2.2 Affected: >= 11.0.0, < 11.1.4
kevva	decompress	Affected: <= 4.2.1

Show details on NVD website

JSON

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{
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                "id": "CVE-2026-101894",
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                  },
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-28T17:38:56.943847Z",
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    "cna": {
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The decompress package for Node.js extracts archives. Prior to 10.2.2 and 11.1.4, the default decompress(input, output) API relies on lexical containment checks that do not account for the kernel following a planted symlink chain. An attacker can supply a crafted archive containing chained symlink entries so that a later entry resolves outside the output directory. This allows files outside output to be read or written, and overwriting startup scripts or configuration can lead to remote code execution. The maintained @xhmikosr/decompress package is fixed in 10.2.2 and 11.1.4, but the separately affected unmaintained decompress package remains unpatched through 4.2.1. This vulnerability results from a bypass of the incomplete hardening for CVE-2026-53486. @xhmikosr/decompress is fixed in versions 10.2.2 and 11.1.4."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
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            "attackVector": "NETWORK",
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            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
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        {
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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