Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-33129

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
20/03/2026
Last modified:
20/03/2026

Description

H3 is a minimal H(TTP) framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison (!==). This allows an attacker to deduce the valid password character-by-character by measuring the server's response time, effectively bypassing password complexity protections. This issue is fixed in version 2.0.1-rc.9.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None

Base Score 3.x
5.90
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:h3:h3:2.0.0:*:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc1:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc2:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc3:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc4:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc5:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc6:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc7:*:*:*:node.js:*:*
cpe:2.3:a:h3:h3:2.0.1:rc8:*:*:*:node.js:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools