Vulnerability Report

CVE-2026-33129

Title: Timing Side-Channel in Basic Authentication

Input Validation Error

Proof Of Concept

No public PoC currently indexed for CVE-2026-33129.

CWE Category CWE-208

Published Date Mar 20, 2026

Modified Date Mar 20, 2026

Exploit Status Not Found

Score 5.9 CVSS v3.1

Exploit Probability (EPSS)

0.32%

Vulnerability Summary

CVE-2026-33129: 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.

Impacted Vendors

allwinner 1

h3 1

Reference Links

https://github.com/h3js/h3/pull/1283 https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9 https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.9

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.9

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-33129 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

March 20, 2026 MODIFIED

Vulnerability data updated via NVD.

March 20, 2026 MODIFIED

Vulnerability data updated via NVD.

March 20, 2026 MODIFIED

Vulnerability data updated via NVD.

March 20, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Stack

No specific products linked.