CVE-2026-82393: Path Traversal (CVSS 7.5)

Description

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-22 Path Traversal

CWE-73 CWE-73

CWE-94 CWE-94

References

Other References

https://github.com/pnpm/pnpm/commit/51300fd41c5e4c8f47635108e373cc3d1f324fa7 https://github.com/pnpm/pnpm/commit/78e29fe5583a1e5d69ea05e414eff310f78d5ed9 https://github.com/pnpm/pnpm/pull/12872 https://github.com/pnpm/pnpm/pull/12890 https://github.com/pnpm/pnpm/releases/tag/v10.34.5 https://github.com/pnpm/pnpm/releases/tag/v11.11.0 https://github.com/pnpm/pnpm/security/advisories/GHSA-vq4v-j7r6-jq4m

Frequently Asked Questions

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-82393? +

CVE-2026-82393 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-82393? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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