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CVE-2026-101897 angular CVE debrief

The CVE-2026-101897 vulnerability is a local denial-of-service (DoS) condition in Angular DevTools. An untrusted sender can direct the extension to use chrome.debugger to attach to another browser tab and trigger Chrome DevTools Protocol breakpoints, potentially disrupting development workflows. This issue is fixed in version 1.21.1. Defenders should prioritize verifying exposure and applying the fixed version. The vulnerability allows an attacker to display a debugging banner, pause JavaScript execution, and prevent interaction with the target tab, but does not provide remote code execution, privilege escalation, or cross-origin access to memory or credentials.

Vendor
angular
Product
DevTools
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders responsible for Angular DevTools installations, developers using Angular, and security teams monitoring for potential denial-of-service conditions should be aware of this vulnerability and take necessary actions.

Why it matters

CVE-2026-101897 is a local denial-of-service vulnerability in Angular DevTools that allows an untrusted sender to direct the extension to use chrome.debugger to attach to another browser tab and trigger Chrome DevTools Protocol breakpoints, potentially disrupting development workflows. Defenders should prioritize verifying exposure and applying the fixed version 1.21.1.

  • Denial-of-service condition in Angular DevTools
  • Potential disruption to development workflows
  • Need for verification of exposure and application of fixed version

Technical summary

The Angular DevTools background service worker accepts chrome.runtime.sendMessage runtime messages from untrusted web pages or third-party content scripts without adequately verifying the message source. This allows for a local denial-of-service condition, enabling an attacker to direct the extension to use chrome.debugger to attach to another browser tab and trigger Chrome DevTools Protocol breakpoints. The issue is fixed in version 1.21.1, and defenders should prioritize verifying exposure and applying the fixed version.

Defensive priority

Defenders should prioritize verifying exposure in Angular DevTools installations and applying the fixed version 1.21.1, as the issue allows for a local denial-of-service condition.

Recommended defensive actions

  • Verify Angular DevTools version and upgrade to 1.21.1 if necessary
  • Review system configurations and ensure proper isolation of development tools
  • Monitor for potential denial-of-service conditions in Angular DevTools
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability in Angular DevTools, including its impact and fixed version. However, additional information on potential exploitation or affected systems is limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-101897 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-101897

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-101897 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-101897

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Angular DevTools (Local DoS)

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/101xxx/CVE-2026-101897.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://github.com/angular/angular/security/advisories/GHSA-r653-wxfp-pp9c

    Supplemental source - x_refsource_CONFIRM

  • Source reference

    Unverified legacy reference

    URL: https://github.com/angular/angular/pull/70623

    Supplemental source - x_refsource_MISC

  • Source reference

    Unverified legacy reference

    URL: https://github.com/angular/angular/commit/7c053599c79a6ddd785a9bae33ff9fc7b355ea0d

    Supplemental source - x_refsource_MISC

  • Source reference

    Unverified legacy reference

    URL: https://github.com/angular/angular/commit/cf492e8a372e2bbddb84987df12c33a52c23c72f

    Supplemental source - x_refsource_MISC

  • Source reference

    Unverified legacy reference

    URL: https://github.com/angular/angular/commit/e02c4d89bcf5da9af499e0dfbba8c29206976ab3

    Supplemental source - x_refsource_MISC

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.