Cyber Resilience

CVE-2026-1528

Nodejs Undici ≤ 6.24.0

Published
12 March 2026
Modified
04 August 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0049 40th percentile
Risk Priority 58 floored blend · peak EPSS

Summary

CVE-2026-1528 is a high-severity Uncaught Exception (CWE-248) vulnerability in Nodejs Undici. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 40th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and SA-8 (Security and Privacy Engineering Principles) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2026-1528 is a denial-of-service vulnerability in the undici library, a Node.js HTTP and WebSocket client. The issue arises in undici's ByteParser when processing a WebSocket frame that uses the 64-bit length form with an extremely large length value. This causes an internal math overflow, leading the parser to an invalid state and triggering a fatal TypeError that terminates the process.

A remote attacker can exploit this vulnerability by controlling a server to which an undici-based client connects over WebSocket. No authentication, privileges, or user interaction are required, as indicated by the CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Successful exploitation results in a crash of the affected client process, enabling denial of service against applications relying on vulnerable undici versions.

Advisories recommend upgrading to undici version v7.24.0 or v6.24.0 or later, where the issue is patched. Additional details are available in the OpenJSF CNA security advisories, the GitHub Security Advisory GHSA-f269-vfmq-vjvj for nodejs/undici, and the related HackerOne report 3537648. The vulnerability is associated with CWE-248 (Uncaught Exception) and CWE-1284 (Immutable Object with Mutable Interface).

OWASP Top 10 for Web (2025)

A10:2025 Mishandling of Exceptional Conditions

EU & UK References

Vulnerability Data

ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched…

more

in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

CWE(s)
CWE-248CWE-1284

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-2229Same product: Nodejs Undici
CVE-2023-24807Same product: Nodejs Undici
CVE-2026-13697Same product: Nodejs Undici
CVE-2026-1525Same product: Nodejs Undici
CVE-2026-11525Same product: Nodejs Undici
CVE-2026-1527Same product: Nodejs Undici
CVE-2026-9679Same product: Nodejs Undici
CVE-2024-24750Same product: Nodejs Undici
CVE-2026-1526Same product: Nodejs Undici
CVE-2026-9675Same product: Nodejs Undici

Affected Assets

nodejs
undici
≤ 6.24.0 · 7.0.0 — 7.24.0

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V6.7.2
  • V1.4.2
  • V2.1.1
  • V2.2.1

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

SI-10 requires validity checks on information inputs, directly stopping acceptance of malformed quantities before they can be used.

SA-8 Security and Privacy Engineering Principles partial match

Security engineering principles include robust exception management to keep the system in a defined state.

SC-24 Fail in Known State partial match

Fail-in-known-state reduces the impact when an uncaught exception occurs by preserving a safe condition.

SI-11 Error Handling partial match

Error handling requirements force structured catching and response to exceptions instead of allowing them to propagate uncaught.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices explicitly require structured exception handling to prevent uncaught exceptions from reaching production.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect uncaught exceptions before production deployment.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle includes exception-handling standards that reduce uncaught exceptions.

A.8.26 Application security requirements partial match
prevents

Application security requirements typically mandate robust error and exception handling.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles call for centralized, comprehensive exception management.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require catching and handling exceptions to prevent crashes or leaks.

References