CVE-2026-56848 | BDVDB-2026-355147 Detail

nodejsnode

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**.

Impact#

Per CVSS v3.0: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-416 Use After Free

References#

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

Exploit#

No public exploit known

History#

Version 12026-08-04Record published in the CVE List.

Published

Published: 2026-08-04
Last modified: 2026-08-04

Vendor information

Vendor: nodejs
Product: node

All nodejs vulnerabilities

Score

7.5 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 47.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 26.5.0 and <= 26.5.0
Fixed
Not stated
Vulnerable
>= 24.18.0 and <= 24.18.0
Fixed
Not stated
Vulnerable
>= 22.23.1 and <= 22.23.1
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

Not available

CVSS v3.0

7.5 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).