CVE-2026-56848

State: Published
Severity: 7.5 High
Published: Aug 4, 2026
Updated: Aug 4, 2026
Reserved: Jun 23, 2026

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**.

Scores

CVSS	Score	Vector	Source
3.0	7.5 High	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	hackerone

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
nodenodejs	26.5.0 through 26.5.0Affected 24.18.0 through 24.18.0Affected 22.23.1 through 22.23.1Affected

References

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

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