CVE-2026-55487Public exploitNetwork attack vector

Code execution via opaque locator normalization collision

Published Jun 25, 2026 · Updated Jun 25, 2026

Origin validation failure in pnpm before 10.34.2 and 11.0.0 through 11.5.2 allows remote attackers to execute lifecycle scripts. The generic peer-suffix normalizer strips parenthesized text from opaque git, URL, tarball, file, and directory locators before allowBuilds compares identities, so distinct sources collide. Exploitation requires a user or CI job to install an attacker-controlled dependency after approving the colliding source, and the resulting lifecycle code runs with that process's privileges.

CVSS severity7.5
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation failure in pnpm before 10.34.2 and 11.0.0 through 11.5.2 allows remote attackers to execute lifecycle scripts. The generic peer-suffix normalizer strips parenthesized text from opaque git, URL, tarball, file, and directory locators before allowBuilds compares identities, so distinct sources collide. Exploitation requires a user or CI job to install an attacker-controlled dependency after approving the colliding source, and the resulting lifecycle code runs with that process's privileges.

The record

CVE
CVE-2026-55487
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
pnpm
Product
pnpm
Classifications
CWE-693, CWE-829, CWE-346, T1195.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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.

  1. Affected versionversion=< 10.34.2
  2. Affected versionversion=>= 11.0.0, < 11.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pnpm · pnpmversion=< 10.34.2; version=>= 11.0.0, < 11.5.3

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CWE-829Inclusion of Functionality from Untrusted Control Sphere
CWE-346Origin Validation Error
T1195.001Compromise Software Dependencies

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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