CVE-2026-56846 — HIGH (7.5)

Vulnerability Description

A flaw in Node.js HTTP/2 handling can cause HTTP/2 retained header blocks evade maxSessionMemory and enable remote memory exhaustion. This vulnerability affects Node.js **24.x** and **22.x**.

CVSS Score

7.5

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Related Weaknesses (CWE)

CWE-400

References

https://nodejs.org/en/blog/vulnerability/july-2026-security-releases

FAQ

What is CVE-2026-56846?

CVE-2026-56846 is a vulnerability with a CVSS score of 7.5 (HIGH). A flaw in Node.js HTTP/2 handling can cause HTTP/2 retained header blocks evade maxSessionMemory and enable remote memory exhaustion. This vulnerability affects Node.js **24.x** and **22.x**.

How severe is CVE-2026-56846?

CVE-2026-56846 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-56846?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.