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CVE-2026-33129— h3 has an observable timing discrepancy in basic auth utils

CVSS 5.9 · Medium EPSS 0.05% · P16
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I. Basic Information for CVE-2026-33129

Vulnerability Information
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Vulnerability Title
h3 has an observable timing discrepancy in basic auth utils
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过时间差异性导致的信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
H3 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
H3是H3开源的一个HTTP框架。 H3 2.0.1-beta.0至2.0.0-rc.8版本存在安全漏洞，该漏洞源于requireBasicAuth函数使用不安全的字符串比较，可能导致时序侧信道攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
h3jsh3 >= 2.0.1-beta.0, < 2.0.1-rc.9 -

II. Public POCs for CVE-2026-33129

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III. Intelligence Information for CVE-2026-33129

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Same Patch Batch · h3js · 2026-03-20 · 3 CVEs total

CVE-2026-331287.5 HIGHh3 has a Server-Sent Events Injection via Unsanitized Newlines in Event Stream Fields
CVE-2026-331317.4 HIGHh3 has a middleware bypass with one gadget

IV. Related Vulnerabilities

Same product: h3
Same vendor: h3js
Same weakness: CWE-208

V. Comments for CVE-2026-33129

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