Is CVE-2026-33129 actively exploited?

No active exploitation of CVE-2026-33129 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33129 be exploited remotely?

Yes. CVE-2026-33129 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33129?

CVE-2026-33129 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-33129

CWE-208Published: March 20, 2026· Updated: Mar 20, 2026

5.9

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33129 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.