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CVE-2026-1526

7.5 · HIGH

The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression.

Published Mar 12, 2026CWE-409EPSS 1.17%

Overview

CVE-2026-1526 is a high-severity vulnerability. It was published on March 12, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive.

The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcna.openjsf.org/security-advisories.htmlRefdatatracker.ietf.org/doc/html/rfc7692GitHubgithub.com/nodejs/undici/security/advisories/GHSA-vrm6-8vpv-qv8qRefhackerone.com/reports/3481206Refaccess.redhat.com/errata/RHSA-2026:13826Refaccess.redhat.com/errata/RHSA-2026:17789Refaccess.redhat.com/errata/RHSA-2026:21772Refaccess.redhat.com/errata/RHSA-2026:21931Refaccess.redhat.com/errata/RHSA-2026:34342Refaccess.redhat.com/errata/RHSA-2026:56431

How CyberStrike helps

Frequently asked questions

What is CVE-2026-1526?

CVE-2026-1526 is a high-severity vulnerability. It was published on March 12, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-1526?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-1526?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-1526?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-1526 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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