AIKIDO-2026-10336
hono is vulnerable to Regular Expression Denial of Service (ReDoS)
45
Medium Risk
This Affects:
honoTL;DR
Affected versions of this package use a regular expression to split accept headers (e.g. Accept-Language) in the accept parsing utilities. A crafted header with many segments can trigger catastrophic backtracking and cause exponential CPU time, leading to denial of service. In proxy setups without header size limits, an attacker can send a malicious Accept-Language value that ties up the process for minutes. The patch replaces the regex-based split with a non-regex implementation to remove the ReDoS behavior.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
hono is vulnerable to Regular Expression Denial of Service (ReDoS) in versions 0.0.1 - 4.12.5.
How to fix this
Upgrade the hono library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001Compliant