Security readout for executives and security teams
Plain-English summary
Older Node.js releases can misread a URL's hostname when the URL uses a mixed-case javascript protocol. If an application trusts that hostname for security decisions, it may allow something it intended to block. The risk depends heavily on application logic, not just the installed Node version.
Executive priority
Treat this as a targeted legacy exposure issue. Prioritize systems that still run old Node.js versions and process user-supplied URLs for access control, redirects, or filtering. It is not documented here as actively exploited, but it can undermine security controls in the wrong code path.
Technical view
CVE-2018-12123 affects Node.js before 6.15.0, 8.14.0, 10.14.0, and 11.3.0. The legacy URL parser url.parse() can return a spoofed hostname for mixed-case javascript: scheme URLs. Other protocols are reported as unaffected. Impact exists where hostname parsing drives allowlists, redirects, content filtering, or similar controls.
Likely exposure
Exposure is most likely in legacy Node.js services or downstream products still carrying vulnerable Node versions, especially code paths that use url.parse() hostname results for security decisions. Modern or patched runtimes are less likely exposed.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. The issue is application-context dependent: attackers would need an affected Node.js runtime and a URL-handling security decision based on the spoofable hostname result.
Researcher notes
Evidence is clear on affected Node.js version ranges and parser behavior, but incomplete on CVSS, real-world exploitation, and downstream product scope. Validate by combining runtime inventory with source review for hostname-based security decisions using url.parse().
Mitigation direction
- Upgrade Node.js to the fixed release line or later.
- Check Red Hat, Gentoo, NetApp, or other vendor guidance for packaged products.
- Audit URL security decisions that rely on url.parse().
- Avoid trusting parsed hostnames from javascript: scheme URLs.
- Add regression tests around URL allowlists and redirect validation.
Validation and detection
- Inventory Node.js versions across applications and appliances.
- Identify uses of url.parse() in URL security logic.
- Review allowlist, redirect, SSRF-filter, and link-sanitization code paths.
- Confirm patched runtime versions in build and production environments.
- Check downstream vendor advisories for affected packaged deployments.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-115: Exact CWE lookup
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Open ATT&CK lookupCVE-2018-12123 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/CVE reference · x_refsource_CONFIRM
- RHSA-2019:1821CVE reference · vendor-advisory, x_refsource_REDHAT
- GLSA-202003-48CVE reference · vendor-advisory, x_refsource_GENTOO
- https://security.netapp.com/advisory/ntap-20241213-0008/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Misinterpretation of Input
Misinterpretation of Input represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.