GHSA-9r2w-394v-53qc · 深刻度： high · エコシステム： npm — Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache poisoning using symbolic links
The npm package "tar" (aka node-tar) before versions 4.4.16, 5.0.8, and 6.1.7 has an arbitrary file creation/overwrite and arbitrary code execution vulnerability. node-tar aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary stat calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory, where the symlink and directory names in the archive entry used backslashes as a path separator on posix systems. The cache checking logic used both `\` and `/` characters as path separators, however `\` is a valid filename character on posix systems. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass node-tar symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. Additionally, a similar confusion could arise on case-insensitive filesystems. If a tar archive contained a directory at `FOO`, followed by a symbolic link named `foo`, then on case-insensitive file systems, the creation of the symbolic link would remove the directory from the filesystem, but _not_ from the internal directory cache, as it would not be treated as a cache hit. A subsequent file entry within the `FOO` directory would then be placed in the target of the symbolic link, thinking that the directory had already been created. These issues were addressed in releases 4.4.16, 5.0.8 and 6.1.7. The v3 branch of node-tar has been deprecated and did not receive patches for these issues. If you are still using a v3 release we recommend you update to a more recent version of node-tar. If this is not possible, a workaround is available in the referenced GHSA-9r2w-394v-53qc.
総合評価: CVE-2021-37701 は中リスク（63.4/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 3.29%、87 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-24 | 3.06% | 3.29% | +0.23% |
| 2 | 2026-06-15 | 0.11% | 3.06% | +2.94% |
| 3 | 2026-03-03 | — | 0.11% | — |
EPSS の全履歴 （全 19 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 8.2 | 3.1 | HIGH |
|
1.8 | 5.8 | [email protected] |
| 8.6 | 3.1 | HIGH |
|
1.8 | 6.0 | [email protected] |
| 4.4 | 2.0 | MEDIUM |
|
3.4 | 6.4 | [email protected] |
GHSA-9r2w-394v-53qc · 深刻度： high · エコシステム： npm — Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache poisoning using symbolic links
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
high | CVE-2021-37701: 2 source package rows (nodejs, tar); 47 state rows across 10 repos (3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 45, open 2. | https://security.alpinelinux.org/vuln/CVE-2021-37701 |
debian
|
not yet assigned | CVE-2021-37701 not yet assigned priority: Debian including 1 source packages (node-tar), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-37701 |
gentoo
|
low | CVE-2021-37701: 1 GLSA(s) (202405-29), 1 atom(s) (net-libs/nodejs); latest impact low. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-37701 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2021-37701 |
suse
|
high | CVE-2021-37701 severity important: SUSE including 43 source package names (12-10.1:nodejs12-12.22.7-4.22.1, 12-10.1:npm12-12.22.7-4.22.1, …), 95 product×package rows across 12 product lines (Container bci/nodejs, SUSE Liberty Linux 8, … (12 product lines)): Fixed 87, Known Not Affected 8. | https://www.suse.com/security/cve/CVE-2021-37701/ |
ubuntu
|
medium | CVE-2021-37701 medium priority: Ubuntu including 1 source packages (node-tar), 15 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 9, needs-triage 4, ignored 1, released 1. | https://ubuntu.com/security/CVE-2021-37701 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| npmjs | tar | < 4.4.16 | cpe:2.3:a:npmjs:tar:*:*:*:*:*:node.js:*:* |
| npmjs | tar | >= 5.0.0, < 5.0.8 | cpe:2.3:a:npmjs:tar:*:*:*:*:*:node.js:*:* |
| npmjs | tar | >= 6.0.0, < 6.1.7 | cpe:2.3:a:npmjs:tar:*:*:*:*:*:node.js:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| oracle | graalvm | 20.3.3 | cpe:2.3:a:oracle:graalvm:20.3.3:*:*:*:enterprise:*:*:* |
| oracle | graalvm | 21.2.0 | cpe:2.3:a:oracle:graalvm:21.2.0:*:*:*:enterprise:*:*:* |
| siemens | sinec_infrastructure_network_services | < 1.0.1.1 | cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf | Patch Third Party Advisory |
| https://github.com/npm/node-tar/security/advisories/GHSA-9r2w-394v-53qc | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/12/msg00023.html | Mailing List Third Party Advisory |
| https://www.debian.org/security/2021/dsa-5008 | Third Party Advisory |
| https://www.npmjs.com/package/tar | Product Third Party Advisory |
| https://www.oracle.com/security-alerts/cpuoct2021.html | Patch Third Party Advisory |