Arbitrary file overwrite via scoped manifest-name traversal
Published Aug 31, 2026 · Updated Sep 2, 2026
Path traversal in pnpm before 10.34.5 and 11.0.0 through 11.10.0 allows remote attackers to overwrite files via a tarball manifest name. The isolated linker passes a scoped package.json name through pickPackage.ts and into raw path.join calls without enforcing node_modules containment. A victim must install an attacker-supplied tarball; the write runs even with lifecycle scripts disabled and can replace writable startup files, Git hooks, or package code, enabling later code execution.
Summary
What happened
Path traversal in pnpm before 10.34.5 and 11.0.0 through 11.10.0 allows remote attackers to overwrite files via a tarball manifest name. The isolated linker passes a scoped package.json name through pickPackage.ts and into raw path.join calls without enforcing node_modules containment. A victim must install an attacker-supplied tarball; the write runs even with lifecycle scripts disabled and can replace writable startup files, Git hooks, or package code, enabling later code execution.
The record
- CVE
- CVE-2026-82393
- Published
- Aug 31, 2026
- Updated
- Sep 2, 2026
- Vendor
- pnpm
- Product
- pnpm
- Classifications
- CWE-22, CWE-73, CWE-94, T1195.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 31, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 10.34.5
- Affected versionversion=>= 11.0.0, < 11.11.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Self-contained tarball manifest traversal proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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