Page generated: 06 Nov 2026, 03:50 UTC
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CVE-2026-106069

A flaw in Node.js TLS hostname verification can cause a server certificate to be validated against a different IP address than the one the client connected to, when the host is a non-canonical IPv4 literal with a leading zero, such as `0127.0.0.1`. `tls.checkServerIdentity()` nor…

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A flaw in Node.js TLS hostname verification can cause a server certificate to be validated against a different IP address than the one the client connected to, when the host is a non-canonical IPv4 literal with a leading zero, such as `0127.0.0.1`. `tls.checkServerIdentity()` normalizes the host following the WHATWG URL rules, which read a leading-zero octet as octal (`0127.0.0.1` becomes `87.0.0.1`), while the connection is made through the operating system resolver, which on some platforms such as macOS reads it as decimal (`127.0.0.1`). A server at the connected address can then be authenticated with a certificate issued for another IP address. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
CVSS 7.4 (HIGH)

Attention and evidence

HYPE SCORE
1.4/10
REALITY · THREAT PRIORITY
2.6/10
General review priority; not probability

Evidence confidence: Insufficient evidence

Why this priority?
  • Technical severity: CVSS 7.4: +2.59
  • Fresh EPSS: 0.30%: +0.01

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 6 documents and public datasets.

Hype components

Headline sample (25%)
10/100
Press, 30 days (60%)
20/100
Grounded branding (15%)
0/100
HYPE TOTAL14/100

Sources and documents

Cisco Security Advisory
Technical advisory · 04 Nov 2026, 18:52 · Vulnerabilities in Node.js and Brotli Affecting Cisco Products: October 2026
Cisco Security Advisory
Technical advisory · 30 Oct 2026, 19:55 · Vulnerabilities in Node.js Affecting Cisco Products: October 2026
Cisco Security Advisory
Press · 30 Oct 2026, 19:55 · Vulnerabilities in Node.js Affecting Cisco Products: October 2026
Avisos INCIBE-CERT
Press · 29 Oct 2026, 08:53 · [Actualización 30/10/2026] Múltiples vulnerabilidades en productos de Cisco
FortiGuard Labs | FortiGuard Center - IR Advisories
Press · 26 Oct 2026, 07:00 · Node2Shell CVEs
See all 6 source documents
Una Al Día
Press · 23 Oct 2026, 08:01 · Node.js corrige fallos graves de TLS y Brotli en sus ramas 26, 24 y 22

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 1.4 · reality 2.6 (2026-11-02 15:14). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs. Published 13 days ago. Exploitation evidence usually takes weeks to show up: a low reality score can mean there is no data yet, not that the flaw is mild.

Evidence in context

Confidence in exploitation evidence
Insufficient evidence
Priority basis
Exploitation in attacks unconfirmed; CVSS 7.4; EPSS 0.3%
Attention, last 30 days
4 distinct story titles; 4 press documents; 4 publisher domains.
Technical potential
network access, no prior privileges, no user interaction, additional attack conditions.
Observed activity
No exploitation observation is recorded.
Known scale
Not quantified.
Evidence confidence basis
Insufficient evidence

Score evaluated: 2026-11-05 13:59:51.107056+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
23 Oct 2026, 08:01
Published
23 Oct 2026, 16:15
Latest press mention
30 Oct 2026, 19:55
Score calculated
05 Nov 2026, 13:59