CVE-2026-56848 — HIGH (7.5)

Vulnerability Description

A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is executing, resulting in a heap-use-after-free. This vulnerability affects Node.js **26.x**, **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-416

References

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

FAQ

What is CVE-2026-56848?

CVE-2026-56848 is a vulnerability with a CVSS score of 7.5 (HIGH). A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is executing, resulting in a heap-use-after-free. This vulnerabili...

How severe is CVE-2026-56848?

CVE-2026-56848 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-2026-56848?

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