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

CVE-2026-123872: Node.js is vulnerable to a client certificate authentication bypass via TLS 1.2 renegotiation servername change

HighCVSS 8.1 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

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: 0.36% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. 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 client certificate authentication bypass in Node.js TLS lets a client change the servername during TLS 1.2 renegotiation to reach endpoints it was not authorized for. On a server that applies different client-certificate policies per hostname, for example stricter admin-only client-cert auth on one host and ordinary client-cert auth on another, a client that authenticates for a permitted host can renegotiate the TLS 1.2 connection under a different servername and carry its existing authentication to the protected host, bypassing the stricter policy. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

Auth bypass

EUVD-2026-123699

Published: Nov 11, 2026
Updated: Nov 12, 2026
EPSS: 0.3% · 30th percentile
CWE: CWE-287

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 32 / 40 · 8.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CNA vs NVD score

NVD: —
CNA · openjs: 8.1; 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

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Noroxi analysis

What does it mean in your environment?

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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.

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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-2026-123864Node.js is vulnerable to cross-connection memory disclosure via TLS write re-entrancy in the HTTPS request parser
32Monitor

Published before and after this one in the same product

← EarlierCVE-2026-123868Nov 11, 2026 · Node.js is vulnerable to an HTTP/2 memory exhaustion denial of service via unaccounted inbound DATA on an undrained stream
23Monitor
← EarlierCVE-2026-123871Nov 11, 2026 · Node.js is vulnerable to proxy credential disclosure via ERR_PROXY_INVALID_CONFIG error messages
24Monitor
Later →CVE-2026-123874Nov 11, 2026 · Node.js is vulnerable to an HTTP/2 use-after-free via respondWithFile() stream reset during a pending write
30Monitor

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+1 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.

pimterryreporter
aduh95coordinator

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 · variant or chain candidate.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: none

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

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-secondary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

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

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

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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