CVSS 3.0
7.5 highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-123865 Node.js is vulnerable to an HTTP/2 memory and file-descriptor leak via a protocol error during session shutdown
High (7.5) in nodejs node. EPSS 0.5% estimated probability of exploitation activity in the next 30 days.
On this page
An unauthenticated HTTP/2 client can permanently leak Node.js server memory and file descriptors. If a peer triggers a protocol error, for example an oversized frame header, while the session is already shutting down, nghttp2 tears the session down internally but Node.js never notices, leaving a dangling session: the socket stays in CLOSE_WAIT and all of Node.js's HTTP/2 state for that connection is held in memory indefinitely, with no further cost to the attacker. The attacker can start the shutdown remotely by sending GOAWAY(NO_ERROR), so it is reliable against default HTTP/2 servers. It is an incomplete-fix case of CVE-2026-48937: that fix detected nghttp2 internal terminations by watching for GOAWAY sent while not shutting down, but missed terminations that arrive while the session is already shutting down. This vulnerability affects Node.js 26.x, 24.x, and 22.x.
Severity
- EPSS
- 0.5% estimated probability of exploitation activity in the next 30 days; 45th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-400 Uncontrolled Resource Consumption
- Published
- Modified
- Assigned by
- openjs (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Explain CVE-2026-123865 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-123865?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-123865?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-123865 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| nodejs node | from 0.0.0 before 22.23.5 |
| nodejs node | from 23.0.0 before 24.22.3 |
| nodejs node | from 25.0.0 before 26.13.1 |
Fix and patched versions
- Red Hat, Alpine, Alpaquita, BellSoft Hardened Containers: fixed package versions per release
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13, 14 | nodejs | no fix listed | DEBIAN-CVE-2026-123865 |
| Ubuntu | 24.04:LTS, 26.04:LTS, 26.10 and 5 more | nodejs | no fix listed | UBUNTU-CVE-2026-123865 |
| Red Hat | hummingbird:1 | nodejs22, nodejs22-bin, nodejs22-docs and 4 more | 1:22.23.5-2.3.2.3.1.hum1 | RHSA-2026:99433 |
| Red Hat | hummingbird:1 | nodejs22-npm | 1:10.9.9-1.22.23.5.2.3.2.3.1.hum1 | RHSA-2026:99433 |
| Red Hat | hummingbird:1 | nodejs24, nodejs24-bin, nodejs24-docs and 3 more | 1:24.22.3-0.1.hum1 | RHSA-2026:99435 |
| Red Hat | hummingbird:1 | nodejs24-npm | 2:11.19.1-1.24.22.3.0.1.hum1 | RHSA-2026:99435 |
| Red Hat | hummingbird:1 | nodejs24-npm-bin | 2:24.22.3-0.1.hum1 | RHSA-2026:99435 |
| Red Hat | hummingbird:1 | nodejs26, nodejs26-bin, nodejs26-docs and 4 more | 1:26.13.1-0.1.hum1 | RHSA-2026:99436 |
| Red Hat | hummingbird:1 | nodejs26-npm | 1:11.20.0-1.26.13.1.0.1.hum1 | RHSA-2026:99436 |
| Alpine | v3.21, v3.22 | nodejs | 22.23.5-r0 | ALPINE-CVE-2026-123865 |
| Alpine | v3.23, v3.24 | nodejs | 24.22.3-r0 | ALPINE-CVE-2026-123865 |
| Alpine | v3.24 | nodejs-current | 26.13.1-r0 | ALPINE-CVE-2026-123865 |
| Alpaquita | stream | nodejs22 | 22.23.5-r0 | BELL-CVE-2026-123865 |
| Alpaquita | stream | nodejs24 | 24.22.3-r0 | BELL-CVE-2026-123865 |
| Alpaquita | stream | nodejs26 | 26.13.1-r0 | BELL-CVE-2026-123865 |
| BellSoft Hardened Containers | stream | nodejs22 | 22.23.5-r0 | BELL-CVE-2026-123865 |
| BellSoft Hardened Containers | stream | nodejs24 | 24.22.3-r0 | BELL-CVE-2026-123865 |
| BellSoft Hardened Containers | stream | nodejs26 | 26.13.1-r0 | BELL-CVE-2026-123865 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Red Hat Security Data © Red Hat, Inc., CC BY 4.0; the Alpine secdb, CC BY-SA 4.0; BellSoft's OSV database, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · Red Hat · Alpine · Alpaquita · BellSoft Hardened Containers.
Red Hat
Red Hat rates this Important.
This vulnerability is rated as Important severity because remote, unauthenticated actors can induce memory and file descriptor leaks with minimal effort, resulting in a complete denial of service. Exposure is limited to deployments where Node.js applications directly handle HTTP/2 connections. Applications running standard HTTP/1.1 or those deployed behind front-end reverse proxies that terminate HTTP/2 traffic are not susceptible to this attack.
Terminate HTTP/2 at an upstream reverse proxy and forward HTTP/1.1 to the Node.js backend. Apply connection/rate limits to contain resource exhaustion (see CME-114).
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | nodejs22 | Affected | |
| Red Hat Enterprise Linux 10 | nodejs24 | Affected | |
| Red Hat Enterprise Linux 10 | nodejs26 | Affected | |
| Red Hat Enterprise Linux 8 | nodejs:22/nodejs | Affected | |
| Red Hat Enterprise Linux 8 | nodejs:24/nodejs | Affected | |
| Red Hat Enterprise Linux 9 | nodejs:22/nodejs | Affected | |
| Red Hat Enterprise Linux 9 | nodejs:24/nodejs | Affected | |
| Red Hat Enterprise Linux 9 | nodejs:26/nodejs | Affected | |
| Red Hat Hardened Images | hi/nodejs | Under investigation | |
| Red Hat Hardened Images | nodejs20 | Will not fix | |
| Red Hat Hardened Images | nodejs22 | Affected | |
| Red Hat Hardened Images | nodejs24 | Affected | |
| Red Hat Hardened Images | nodejs25 | Will not fix | |
| Red Hat Hardened Images | nodejs26 | Affected | |
| Red Hat Hardened Images | npm12 | Under investigation |
Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-123865.
Attack patterns (CAPEC)
- CAPEC-147 XML Ping of the Death Likelihood: Low · Severity: Medium
- CAPEC-227 Sustained Client Engagement
- CAPEC-492 Regular Expression Exponential Blowup
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.