CVE-2026-56848

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-04 · updated 2026-10-24
Weakness: CWE-416

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**.

Affected products

Node.js: from 26.5.0 through 26.5.0; from 24.18.0 through 24.18.0; from 22.23.1 through 22.23.1

References

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

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