CVE-2026-56764
Received Received - Intake

Timing Attack in Hono Authentication Middleware

Publication date: 2026-07-15

Last updated on: 2026-07-15

Assigner: VulnCheck

Description
Hono before 4.11.10 contains a timing attack vulnerability in the basicAuth and bearerAuth middlewares due to non-constant-time string comparison in the timingSafeEqual function. Attackers can exploit early termination of string equality checks to infer valid credentials through precise timing measurements.

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Meta Information

Published
2026-07-15
Last Modified
2026-07-15
Generated
2026-07-15
AI Q&A
2026-07-15
EPSS Evaluated
N/A
NVD
CVE-2026-56764
EUVD
EUVD-2026-44631

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-208 Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.

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Executive Summary

CVE-2026-56764 is a timing attack vulnerability in the Hono web framework affecting versions before 4.11.10. It involves the basicAuth and bearerAuth middlewares where a non-constant-time string comparison in the timingSafeEqual function allows attackers to infer valid credentials by measuring response timing differences.

Impact Analysis

Attackers could exploit this to guess valid credentials by analyzing timing differences in responses. However, exploitation requires highly controlled conditions and is considered unlikely in normal environments. The impact is limited to potential credential inference.

Detection Guidance

Detecting this vulnerability requires checking the version of Hono being used. Run 'npm list hono' or check your package.json to see if the installed version is less than 4.11.10. If so, the system is vulnerable.

Mitigation Strategies

Upgrade Hono to version 4.11.10 or later immediately. Use 'npm update hono' or adjust your package.json to specify the fixed version. No additional commands are needed beyond the upgrade.

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