What’s Vulnerable › Vulnerabilities

CVE-2026-82393: pnpm: A tarball dependency's manifest `name` escapes node_modules → arbitrary file write/overwrite on install

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-31 · updated 2026-09-09
• Weakness: CWE-22

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.

Affected products

• pnpm: before 10.34.5; from 11.0.0, < 11.11.0

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
• https://github.com/pnpm/pnpm/security/advisories/GHSA-vq4v-j7r6-jq4m

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