pnpm: manifest identity spoof satisfies allowBuilds and runs attacker lifecycle

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Summary

CVECVE-2026-55487
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 18:16:40 UTC
Updated2026-06-29 21:16:26 UTC
Descriptionpnpm is a package manager. Prior to 10.34.2 and 11.5.3, the generic peer-suffix normalizer also stripped parenthesized text from git, URL, tarball, file, and other opaque locators. Approval for one source string could therefore authorize a different attacker-controlled source whose locator normalized to the same value. This vulnerability is fixed in 10.34.2 and 11.5.3.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.001100000 probability, percentile 0.015090000 (date 2026-06-29)

Problem Types: CWE-346 | CWE-693 | CWE-829 | CWE-346 CWE-346: Origin Validation Error | CWE-693 CWE-693: Protection Mechanism Failure | CWE-829 CWE-829: Inclusion of Functionality from Untrusted Control Sphere

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Pnpm Pnpm All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pnpm Pnpm affected < 10.34.2 Not specified
CNA Pnpm Pnpm affected >= 11.0.0, < 11.5.3 Not specified

References

ReferenceSourceLinkTags
github.com/pnpm/pnpm/security/advisories/GHSA-5wx6-mg75-v57r 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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