CVE-2026-23950: 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…

PriorityP336medium5.9CVSS 3.1

AVNACHPRNUINSUCNIHAN

EPSS

0.23%

14.1th percentile

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.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
debian	node-tar	< node-tar 6.2.1+ds1+~cs6.1.13-7 (forky)	node-tar 6.2.1+ds1+~cs6.1.13-7 (forky)
gnu	tar	>= 0 < 7.5.4	7.5.4
isaacs	node-tar	< 7.5.4	7.5.4
isaacs	node-tar	>= 0 < 6.2.1+ds1+~cs6.1.13-7	6.2.1+ds1+~cs6.1.13-7
isaacs	tar	< 7.5.4	7.5.4

CVSS provenance

nvdv3.15.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

osv5.9MEDIUM

vendor_debian8.8LOW

vendor_redhat8.8HIGH

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