CVE-2026-55849

Command execution via unsanitized workspace argument

Published Jul 8, 2026 · Updated Jul 8, 2026

Command injection in CycloneDX SBOM for npm 2.1.0 through 4.2.1 allows context-dependent attackers to execute OS commands via a workspace value. The CLI's npmRunner fallback interpolates the user-controlled --workspace argument into a subshell command without escaping shell metacharacters. Exploitation requires npm_execpath to be unset or empty, and injected commands run with the invoking user's privileges.

CVSS severity8.5
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in CycloneDX SBOM for npm 2.1.0 through 4.2.1 allows context-dependent attackers to execute OS commands via a workspace value. The CLI's npmRunner fallback interpolates the user-controlled --workspace argument into a subshell command without escaping shell metacharacters. Exploitation requires npm_execpath to be unset or empty, and injected commands run with the invoking user's privileges.

The record

CVE
CVE-2026-55849
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
CycloneDX
Product
CycloneDX SBOM for npm
Classifications
CWE-78, T1059
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.1.0, < 5.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

CycloneDX · CycloneDX SBOM for npmversion=>= 2.1.0, < 5.0.0

Published CVSS scores

8.5GitHubCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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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