GHSA-r6q2-hw4h-h46w · 深刻度： high · エコシステム： npm — Race Condition in node-tar Path Reservations via Unicode Ligature Collisions on macOS APFS
node-tar,a Tar for Node.js, has a race condition vulnerability in versions up to and including 7.5.3. This is due to an incomplete handling of Unicode path collisions in the `path-reservations` system. On case-insensitive or normalization-insensitive filesystems (such as macOS APFS, In which it has been tested), the library fails to lock colliding paths (e.g., `ß` and `ss`), allowing them to be processed in parallel. This bypasses the library's internal concurrency safeguards and permits Symlink Poisoning attacks via race conditions. The library uses a `PathReservations` system to ensure that metadata checks and file operations for the same path are serialized. This prevents race conditions where one entry might clobber another concurrently. This is a Race Condition which enables Arbitrary File Overwrite. This vulnerability affects users and systems using node-tar on macOS (APFS/HFS+). Because of using `NFD` Unicode normalization (in which `ß` and `ss` are different), conflicting paths do not have their order properly preserved under filesystems that ignore Unicode normalization (e.g., APFS (in which `ß` causes an inode collision with `ss`)). This enables an attacker to circumvent internal parallelization locks (`PathReservations`) using conflicting filenames within a malicious tar archive. The patch in version 7.5.4 updates `path-reservations.js` to use a normalization form that matches the target filesystem's behavior (e.g., `NFKD`), followed by first `toLocaleLowerCase('en')` and then `toLocaleUpperCase('en')`. As a workaround, users who cannot upgrade promptly, and who are programmatically using `node-tar` to extract arbitrary tarball data should filter out all `SymbolicLink` entries (as npm does) to defend against arbitrary file writes via this file system entry name collision issue.
総合評価: CVE-2026-23950 は公開エクスプロイトあり（50.9/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 0.01%、2 パーセンタイル） 根拠: 公開エクスプロイトが 1 件参照されています（Exploit-DB）。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
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。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 2026-01-20 | — | 0.01% | — |
EPSS の全履歴 （全 1 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 |
|---|---|---|---|---|---|---|
| 8.8 | 3.1 | HIGH |
|
2.8 | 5.3 | [email protected] |
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
GHSA-r6q2-hw4h-h46w · 深刻度： high · エコシステム： npm — Race Condition in node-tar Path Reservations via Unicode Ligature Collisions on macOS APFS
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2026-23950: 1 source package rows (npm); 13 state rows across 3 repos (3.23-community, edge-community, edge-main); fixed 1, open 12. | https://security.alpinelinux.org/vuln/CVE-2026-23950 |
debian
|
unimportant | CVE-2026-23950 unimportant priority: Debian including 1 source packages (node-tar), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. | https://security-tracker.debian.org/tracker/CVE-2026-23950 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2026-23950 |
ubuntu
|
medium | CVE-2026-23950 medium priority: Ubuntu including 1 source packages (node-tar), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needs-triage 8. | https://ubuntu.com/security/CVE-2026-23950 |
| URL | タグ |
|---|---|
| https://github.com/isaacs/node-tar/commit/3b1abfae650056edfabcbe0a0df5954d390521e6 | Patch |
| https://github.com/isaacs/node-tar/security/advisories/GHSA-r6q2-hw4h-h46w | Exploit Mitigation Vendor Advisory |