CVE.org (no NVD analysis yet)· CNA openjs

CVE-2026-123866: Node.js is vulnerable to HTTP/2 response memory disclosure via a use-after-free during stream teardown

HighCVSS 7.5 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.48% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: nodejs node 22.23.5, 24.22.3, 26.13.1.

Low priority for now. Upgrade to nodejs node 22.23.5, 24.22.3, 26.13.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A use-after-free in Node.js HTTP/2 stream teardown can leak response memory, including the contents of other connections' response buffers, to a peer. When a stream is torn down while a write is still backpressured, for example by a peer RST_STREAM or by the server's own per-stream timeout destroying the stream, the stream's response buffer is freed but a reference to it is still used, so freed or unrelated heap memory is written to the socket instead of the intended response. On Node.js 26.x and 24.x the teardown can be driven purely by a remote peer once the window-size change from 26.9.0 and 24.22.0 is present, and on all supported lines the same defect is reachable through an application-initiated teardown such as a per-stream idle timeout. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

EUVD-2026-123687

Published: Nov 11, 2026
Updated: Nov 12, 2026
EPSS: 0.4% · 41th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CNA vs NVD score

NVD: —
CNA · openjs: 7.5; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Using node? Add it to your stack and be the first to know about CVEs like this one. (Node.js)

Versions reported by the vendor

Affected version ranges reported by the assigning authority (openjs). Independent of NVD's CPE analysis and usually ahead of it.

nodejs node
- 0.0.0 and later · before 22.23.5affected · semver
- 23.0.0 and later · before 24.22.3affected · semver
- 25.0.0 and later · before 26.13.1affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Alpine:v3.21	nodejs	before 22.23.5-r0	22.23.5-r0
Alpine:v3.23	nodejs	before 24.22.3-r0	24.22.3-r0
Alpine:v3.24	nodejs-current	before 26.13.1-r0	26.13.1-r0
Debian:12	nodejs	from 0	—

Same product

nodejs: all records

Other highest-scoring records for the same primary product.

CVE-2024-27983An attacker can make the Node.js HTTP/2 server completely unavailable by sending a small amount of HTTP/2 frames packets with a few HTTP/2…
57Plan
CVE-2025-27210An incomplete fix has been identified for CVE-2025-23084 in Node.js, specifically affecting Windows device names like CON, PRN, and AUX.
34Monitor
CVE-2026-123872Node.js is vulnerable to a client certificate authentication bypass via TLS 1.2 renegotiation servername change
32Monitor

Published before and after this one in the same product

← EarlierCVE-2026-123864Nov 11, 2026 · Node.js is vulnerable to cross-connection memory disclosure via TLS write re-entrancy in the HTTPS request parser
32Monitor
← EarlierCVE-2026-123865Nov 11, 2026 · Node.js is vulnerable to an HTTP/2 memory and file-descriptor leak via a protocol error during session shutdown
30Monitor
Later →CVE-2026-123867Nov 11, 2026 · Node.js is vulnerable to a per-host mTLS authorization bypass via a CA-only SNI context failing open to the default CA
16Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
nodejs node	22.23.5	Vendor (CNA)
nodejs node	24.22.3	Vendor (CNA)
nodejs node	26.13.1	Vendor (CNA)
alpine:nodejs	22.23.5-r0 · Alpine:v3.21	Package registry (OSV)
alpine:nodejs-current	26.13.1-r0 · Alpine:v3.24	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedNov 11, 2026
Fix recordedNov 11, 2026same day
TodayNov 13, 2026+2 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

aidan02reporter
mcollinaremediation developer
aduh95coordinator

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-1238640 days apartNode.js is vulnerable to cross-connection memory disclosure via TLS write re-entrancy in the HTTPS request parser
32Monitor
CVE-2026-1238740 days apartNode.js is vulnerable to an HTTP/2 use-after-free via respondWithFile() stream reset during a pending write
30Monitor
CVE-2026-5684899 days apartA flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is…
30Monitor

Bug bounty scope

Node.jsHackerOne · paid

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Not on record for this CVE: patch commit or PR link.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: none
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log (2)

Exploit maturity— → noneNov 11, 2026, 8:07 PM UTC
Fix✗ → ✓Nov 11, 2026, 8:07 PM UTC

For records you follow, these changes also arrive as notifications. →

References

cna.openjsf.org/security-advisories.html

Show all references (1 more)

nodejs.org/en/blog/vulnerability/november-2026-security-releases

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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