Security readout for executives and security teams
Plain-English summary
CVE-2016-10521 is a denial-of-service risk in the jshamcrest Node module. If an application sends certain user-controlled input to its emailAddress validator, the validation regex can consume excessive CPU and slow or stall the service.
Executive priority
Treat as a targeted availability risk. Prioritize review if jshamcrest is used on internet-facing signup, contact, or account flows; otherwise handle through dependency hygiene and planned remediation.
Technical view
The source bundle describes a regular expression denial of service issue in jshamcrest's emailAddress validator, mapped to CWE-400. All listed versions are affected. No CVSS score, fixed version, patch, or vendor mitigation is provided in the supplied sources.
Likely exposure
Exposure is likely limited to Node.js applications that depend on jshamcrest and validate untrusted email-like input with emailAddress, especially on public forms or APIs.
Exploitation context
The supplied sources do not show known active exploitation, and CISA KEV status is false. Abuse would require reaching code paths that run the vulnerable validator on crafted input.
Researcher notes
Evidence is sparse: the bundle identifies the vulnerable component, affected scope, weakness type, and trigger area, but not CVSS metrics, a patched release, or detailed maintainer remediation. Avoid assuming exploit maturity beyond reachable ReDoS behavior.
Mitigation direction
- Inventory package manifests and lockfiles for jshamcrest usage.
- Check vendor or maintainer guidance for any replacement or remediation path.
- Avoid using emailAddress on untrusted input until remediated.
- Consider replacing jshamcrest if all deployed versions remain affected.
- Apply request size, timeout, and rate controls around public validation endpoints.
Validation and detection
- Confirm whether jshamcrest is present in production dependency trees.
- Search application code for emailAddress validator usage.
- Map validator calls to public routes, APIs, and forms.
- Review runtime monitoring for validation-related CPU spikes or request stalls.
- Use bounded regression tests to confirm validation cannot hang the service.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2016-10521 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://nodesecurity.io/advisories/53CVE reference · x_refsource_MISC
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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.