Improper certificate validation for non-canonical IPv4 hostnames allows DNS SANs to authenticate IP endpoints

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

not scored

EPSS

• CVE-2026-106072: 0.62% estimated exploitation activity in the next 30 days; percentile 49.61 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

A flaw in Node.js TLS hostname verification allows a certificate with only a DNS SAN to authenticate an IP endpoint when the client connects using a non-canonical IPv4 spelling, such as `0177.0.0.1`, `0x7f.0.0.1`, `2130706433` or `127.1`. `tls.checkServerIdentity()` did not classify these hosts as IP addresses, but normalized them to their canonical form and matched the result against the certificate DNS names. A certificate containing `DNS:127.0.0.1` and no `IP Address:127.0.0.1` SAN was therefore accepted, while the same certificate is correctly rejected for `127.0.0.1`. Exploitation requires a certificate with a numeric DNS SAN issued by a CA trusted by the client, and a platform resolver that accepts these spellings, such as glibc. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

Published by the source

20 Oct 2026, 00:00 UTC

Last modified by the source

29 Oct 2026, 10:56 UTC

Source last checked

30 Oct 2026, 07:10 UTC

1. Revision 3 · amended · 30 Oct 2026

   Amended from osv record BIT-node-min-2026-106072

2. Revision 2 · amended · 30 Oct 2026

   Amended from osv record BIT-node-2026-106072

3. Revision 1 · created · 29 Oct 2026

   Published from vendor_advisory record nodejs-security-wg:core:201

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-106072

Advisory: Improper certificate validation for non-canonical IPv4 hostnames allows DNS SANs to authenticate IP endpoints
IDs: CVE-2026-106072
Record: https://patchnext.com/advisories/cve-2026-106072 (revision 3, source checked 30 Oct 2026, 07:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: node-min 26.12.1, 24.22.1, 22.23.4; node 26.12.1, 24.22.1, 22.23.4; node 26.12.1, 24.22.1, 22.23.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Bitnami node-min: affected < 22.23.4; >= 23.0.0, < 24.22.1; >= 25.0.0, < 26.12.1; fixed in 26.12.1, 22.23.4, 24.22.1
- runtime node: affected >= 22.0.0, < 22.23.4; >= 24.0.0, < 24.22.1; >= 26.0.0, < 26.12.1; fixed in 26.12.1, 22.23.4, 24.22.1
- Bitnami node: affected < 22.23.4; >= 23.0.0, < 24.22.1; >= 25.0.0, < 26.12.1; fixed in 26.12.1, 22.23.4, 24.22.1

## Suggested inspection (read-only)
- Bitnami node-min: check the installed version with your package manager.
- runtime node: check the installed version with your package manager.
- Bitnami node: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on node-min, node.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://raw.githubusercontent.com/nodejs/security-wg/main/vuln/core/201.json (Node.js security working group core entry 201 lists CVE-2026-106072 affecting node >=22.0.0 =24.0.0 =26.0.0 <26.12.1)
- Verified: https://nodejs.org/dist/index.json (The nodejs.org release index dates the first patched release for CVE-2026-106072 to 2026-10-20.)
- Verified: https://osv.dev/vulnerability/BIT-node-min-2026-106072 (OSV record BIT-node-min-2026-106072 lists affected ranges: Bitnami node-min >=0 =23.0.0 =25.0.0 <26.12.1 (fixed))
- Verified: https://osv.dev/vulnerability/BIT-node-2026-106072 (OSV record BIT-node-2026-106072 lists affected ranges: Bitnami node >=0 =23.0.0 =25.0.0 <26.12.1 (fixed))

Commands are suggestions: review each one before running it.