Cyber Resilience

CVE-2026-55698

Pnpm ≤ 10.34.2

Public PoC
Published
25 June 2026
Modified
30 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 8.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0027 18th percentile
Risk Priority 63 floored blend · peak EPSS

Summary

CVE-2026-55698 is a high-severity Insufficient Verification of Data Authenticity (CWE-345) vulnerability in Pnpm Pnpm. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Supply Chain Compromise (T1195); ranked at the 18th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to CM-14 (Signed Components) and SC-23 (Session Authenticity) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability Data

pnpm is a package manager. Prior to 10.34.2 and 11.5.3, pnpm can persist package-manager bootstrap metadata in the first YAML document of pnpm-lock.yaml. Before the patch, direct pnpm execution trusted an already resolved packageManagerDependencies entry when the committed env lockfile…

more

contained matching pnpm and @pnpm/exe versions. A malicious repository could therefore commit package-manager lockfile package records and snapshots that bypassed fresh package-manager resolution, then cause pnpm to install and execute bytes selected by that committed lockfile state during automatic version switching. This vulnerability is fixed in 10.34.2 and 11.5.3.

CWE(s)
CWE-345CWE-494CWE-829

Related Threats

MITRE ATT&CK Enterprise Techniques

T1195 Supply Chain Compromise Initial Access
Adversaries may manipulate products or product delivery mechanisms prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
T1553.005 Mark-of-the-Web Bypass Defense Impairment
Adversaries may abuse specific file formats to subvert Mark-of-the-Web (MOTW) controls.
attack.mitre.org →
T1072 Software Deployment Tools Execution
Adversaries may gain access to and use centralized software suites installed within an enterprise to execute commands and move laterally through the network.
attack.mitre.org →
T1176 Software Extensions Persistence
Adversaries may abuse software extensions to establish persistent access to victim systems.
attack.mitre.org →
T1195.001 Compromise Software Dependencies and Development Tools Initial Access
Adversaries may manipulate software dependencies and development tools prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
T1195.002 Compromise Software Supply Chain Initial Access
Adversaries may manipulate application software prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-50573Same product: Pnpm Pnpm
CVE-2026-55697Same product: Pnpm Pnpm
CVE-2025-69263Same product: Pnpm Pnpm
CVE-2026-55487Same product: Pnpm Pnpm
CVE-2025-69264Same product: Pnpm Pnpm
CVE-2026-50021Same product: Pnpm Pnpm
CVE-2026-48995Same product: Pnpm Pnpm
CVE-2024-47829Same product: Pnpm Pnpm
CVE-2026-24131Same product: Pnpm Pnpm
CVE-2023-37478Same product: Pnpm Pnpm

Affected Assets

pnpm
pnpm
≤ 10.34.2 · 11.0.0 — 11.5.3

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 23 hardening rules · 6 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V14.2.3
  • V3.5.5
  • V3.5.6
  • V9.1.3

Mitigating Controls (NIST 800-53 r5) AI

CM-14 Signed Components good match

Requires digital signature verification before component installation, directly stopping execution of code downloaded without integrity checks.

SC-23 Session Authenticity good match

Explicit requirement to protect session authenticity structurally prevents the weakness for communications.

SI-7 Software, Firmware, and Information Integrity good match

Integrity verification tools detect (but do not stop) the acceptance of data lacking authenticity.

SR-4 Provenance good match

Requires documented, valid provenance for components, preventing acceptance of code from outside the trusted sphere.

SC-13 Cryptographic Protection partial match

Cryptographic mechanisms can be used to verify authenticity, thereby preventing acceptance of invalid data.

SC-16 Transmission of Security and Privacy Attributes partial match

Associating security attributes with exchanged information supports verification of authenticity.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

ID.RA-09 full match
prevents

Directly requires assessing authenticity/integrity of software before acquisition and use, preventing unverified downloads.

GV.SC-01 mostly match
prevents

Supply-chain program directly governs inclusion of third-party executable code.

GV.SC-05 mostly match
prevents

Contractual requirements can mandate trusted sources and integrity checks for included functionality.

GV.SC-07 mostly match
prevents

Supplier risk assessment explicitly covers risks from their products and libraries.

ID.RA-10 mostly match
prevents

Critical-supplier assessment reduces risk of importing executable functionality from untrusted parties.

PR.DS-02 mostly match
prevents

Requires cryptographic integrity protections (signatures/hashes) for data-in-transit, covering downloaded code.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.21 Managing information security in the ICT supply chain mostly match
prevents

By requiring suppliers to propagate security requirements and to disclose component provenance, the control limits the inclusion of functionality obtained from untrusted third-party sources without oversight.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect missing or weak data authenticity verification.

A.8.20 Networks security partial match
mitigates

Network controls can enforce authenticated channels, reducing risk of accepting unauthentic data.

A.8.21 Security of network services partial match
mitigates

Secure network services often include authenticity checks for data exchanged over those services.

A.8.24 Use of cryptography partial match
prevents

Cryptographic mechanisms directly verify data origin and integrity, preventing acceptance of unauthentic data.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC incorporates authenticity verification requirements throughout development.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (3 rules)
  • V-248574 YUM must be configured to prevent the installation of patches, service packs, device drivers, or OL 8 system components that have not been digitally signed using a certificate that is recognized and approved by the organization. prevents CWE-345
  • V-248575 OL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-345, CWE-494
  • V-248635 Executable search paths within the initialization files of all local interactive OL 8 users must only contain paths that resolve to the system default or the user's home directory. prevents CWE-829
Oracle Linux 9 (3 rules)
  • V-271524 OL 9 must check the GPG signature of software packages originating from external software repositories before installation. prevents CWE-494
  • V-271525 OL 9 must have GPG signature verification enabled for all software repositories. prevents CWE-345
  • V-271847 OL 9 must be configured so that executable search paths within the initialization files of all local interactive users must only contain paths that resolve to the system default or the users home directory. prevents CWE-829
RHEL 7 (3 rules)
  • V-204447 The Red Hat Enterprise Linux operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-345, CWE-494
  • V-204448 The Red Hat Enterprise Linux operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-345, CWE-494
  • V-204477 The Red Hat Enterprise Linux operating system must be configured so that all local interactive user initialization files executable search paths contain only paths that resolve to the users home directory. prevents CWE-829
RHEL 8 (3 rules)
  • V-230264 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-345, CWE-494
  • V-230265 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. prevents CWE-345
  • V-230317 Executable search paths within the initialization files of all local interactive RHEL 8 users must only contain paths that resolve to the system default or the users home directory. prevents CWE-829
RHEL 9 (3 rules)
  • V-257820 RHEL 9 must check the GPG signature of software packages originating from external software repositories before installation. prevents CWE-494
  • V-257822 RHEL 9 must have GPG signature verification enabled for all software repositories. prevents CWE-345
  • V-258050 Executable search paths within the initialization files of all local interactive RHEL 9 users must only contain paths that resolve to the system default or the users home directory. prevents CWE-829
Windows 10 (1 rule)
  • V-220737 Administrative accounts must not be used with applications that access the Internet, such as web browsers, or with potential Internet sources, such as email. prevents CWE-829

References