# CVE-2026-56848 — nodejs node

> As of 2026-08-04, CVE-2026-56848 is a HIGH-severity vulnerability in nodejs node, CVSS v3.1 7.5, EPSS 0.4% (40.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-56848, most recently “Node.js Patches 11 Security Flaws Across v22.23.2, v24.18.1, v26.5.1 (HTTP/2 DoS, Permission Model Bypass, TLS/mTLS Issues)”.

**Last updated:** 2026-08-04

## What is CVE-2026-56848?

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**.

The record classifies CVE-2026-56848 under weakness class [CWE-416](https://intel.threadlinqs.com/cwe/CWE-416). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 67 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 40.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 7.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-04

## Is CVE-2026-56848 being exploited?

Weaponised exploit code for CVE-2026-56848 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

- [open-flaw/CVE-2026-56848](https://github.com/open-flaw/CVE-2026-56848) (github)

## Affected products and versions

- [nodejs](https://intel.threadlinqs.com/vendors/nodejs): node

## How to fix CVE-2026-56848

No vendor patch reference has been recorded for CVE-2026-56848 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-56848

1 tracked threat in the Threadlinqs corpus references CVE-2026-56848, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Node.js Patches 11 Security Flaws Across v22.23.2, v24.18.1, v26.5.1 (HTTP/2 DoS, Permission Model Bypass, TLS/mTLS Issues)](https://intel.threadlinqs.com/threat/TL-2026-1807) — HIGH · 2026-08-01

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [nodejs.org](https://nodejs.org/en/blog/vulnerability/july-2026-security-releases)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-56848
Full detection coverage and IOCs for threats exploiting CVE-2026-56848 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp