CVE-2026-123875: Node.js is vulnerable to an HTTP/2 denial of service via a NULL pointer dereference when a respondWithFile() download is cancelled
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.4%
EPSS score, percentile 34.2 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 5.9 Medium
CVSS v3.0 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
- Which versions are affected?
Affected
- from 0.0.0 to before 22.23.5
- from 23.0.0 to before 24.22.3
- from 25.0.0 to before 26.13.1
Source: CISA KEV 2026.11.10, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
Node.js is vulnerable to an HTTP/2 denial of service via a NULL pointer dereference when a respondWithFile() download is cancelled
A NULL pointer dereference in Node.js HTTP/2 lets an unauthenticated client crash the server, over both TLS and cleartext, by cancelling file downloads. When the server serves a file with stream.respondWithFile() or stream.respondWithFD() and the client cancels the request, a StreamPipe used for the transfer is torn down in an order that leaves a NULL pointer which is then dereferenced, aborting the process. No crafted frames are needed, and a handful of cancelled requests against a default file-serving handler is enough. This vulnerability affects Node.js 26.x, 24.x, and 22.x.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (1 product)
| Status | Versions |
|---|---|
| Affected | from 0.0.0 to before 22.23.5 |
| Affected | from 23.0.0 to before 24.22.3 |
| Affected | from 25.0.0 to before 26.13.1 |
Versions not listed are: unaffected.
Source: CVE List, as of . About the data.
Weakness
CWE-476
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published |