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CVE-2026-48934 nodejs CVE debrief

A flaw in Node.js TLS host verification can cause an attacker to bypass certification validation. This vulnerability affects all supported release lines: Node.js 22, Node.js 24, and Node.js 26. The Common Vulnerabilities and Exposures (CVE) score for this vulnerability is 4.3, with a Medium severity rating. The vulnerability was published on June 26, 2026, and last modified on June 29, 2026. Node.js has released security patches for this vulnerability.

Vendor
nodejs
Product
node
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-26
Original CVE updated
2026-06-29
Advisory published
2026-06-26
Advisory updated
2026-06-29

Who should care

Developers and administrators using Node.js 22, 24, or 26 should prioritize patching this vulnerability to prevent potential attacks. The vulnerability allows an attacker to bypass TLS host verification, which could lead to security breaches. Organizations relying on Node.js for their applications should take immediate action to mitigate this risk.

Technical summary

The CVE-2026-48934 vulnerability is caused by a flaw in Node.js TLS host verification. An attacker can exploit this vulnerability to bypass certification validation, potentially leading to security breaches. The vulnerability affects Node.js 22, 24, and 26, and has a CVSS score of 4.3 with a Medium severity rating. The vulnerability was introduced due to a weakness in the TLS host verification process, which allows an attacker to bypass certification validation. Node.js has released security patches to address this vulnerability.

Defensive priority

Patching this vulnerability is of high priority due to its Medium severity rating and potential impact on Node.js applications. Administrators should apply the security patches provided by Node.js as soon as possible to prevent potential attacks.

Recommended defensive actions

  • Apply the security patches provided by Node.js to address the vulnerability.
  • Review and update Node.js installations to ensure they are running patched versions.
  • Monitor Node.js applications for potential security breaches.
  • Consider implementing additional security measures to detect and prevent attacks.

Evidence notes

The CVE-2026-48934 vulnerability was published on June 26, 2026, and last modified on June 29, 2026. The vulnerability affects Node.js 22, 24, and 26, and has a CVSS score of 4.3 with a Medium severity rating. Node.js has released security patches to address this vulnerability. The vulnerability allows an attacker to bypass TLS host verification, potentially leading to security breaches.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48934 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48934

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

  • CVE-2026-48934 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48934

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

Supplemental references

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.