# CVE-2026-82393 — pnpm

> As of 2026-09-01, CVE-2026-82393 is a HIGH-severity vulnerability in pnpm, CVSS v3.1 7.5, EPSS 0.4% (34.3th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-82393 as of 2026-09-01; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-01

## What is CVE-2026-82393?

pnpm is a package manager. Prior to 10.34.5 and 11.11.0, pnpm accepts a scoped path traversal in a tarball dependency's package.json manifest name because pnpm11/resolving/npm-resolver/src/pickPackage.ts rejects slash characters only for unscoped names. During pnpm install, the unvalidated name reaches raw path joins in pnpm11/installing/deps-resolver/src/resolvePeers.ts, pnpm11/installing/deps-resolver/src/index.ts, and pnpm11/deps/graph-builder/src/lockfileToDepGraph.ts, causing package extraction outside node_modules and allowing attacker-controlled files to overwrite arbitrary filesystem paths even when --ignore-scripts is used. The overwrite can replace shell startup files, Git hooks, or installed package code and lead to code execution. This issue is fixed in versions 10.34.5, and 11.11.0.

The record classifies CVE-2026-82393 under weakness classes [CWE-22](https://intel.threadlinqs.com/cwe/CWE-22), [CWE-73](https://intel.threadlinqs.com/cwe/CWE-73), [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 35 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 34.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-31, last modified 2026-09-01

## Is CVE-2026-82393 being exploited?

Weaponised exploit code for CVE-2026-82393 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 46 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-82393.md) (trickest)

## Affected products and versions

- **pnpm**: pnpm

## How to fix CVE-2026-82393

No vendor patch reference has been recorded for CVE-2026-82393 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-82393

No threat campaign in the Threadlinqs corpus currently references CVE-2026-82393, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-09-02. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/pnpm/pnpm/security/advisories/GHSA-vq4v-j7r6-jq4m)

**Other references**

- [github.com](https://github.com/pnpm/pnpm/pull/12872)
- [github.com (12890)](https://github.com/pnpm/pnpm/pull/12890)
- [github.com (51300fd41c5e4c8f47635108e373cc3d1f324fa7)](https://github.com/pnpm/pnpm/commit/51300fd41c5e4c8f47635108e373cc3d1f324fa7)
- [github.com (78e29fe5583a1e5d69ea05e414eff310f78d5ed9)](https://github.com/pnpm/pnpm/commit/78e29fe5583a1e5d69ea05e414eff310f78d5ed9)
- [github.com (v10.34)](https://github.com/pnpm/pnpm/releases/tag/v10.34.5)

_Showing 6 of 7 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-82393
Full detection coverage and IOCs for threats exploiting CVE-2026-82393 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp