AIKIDO-2025-10702
sinatra is vulnerable to Inefficient Regular Expression Complexity
30
Low Risk
This Affects:
sinatraTL;DR
Affected versions of this package are vulnerable to a Regular Expression Denial of Service (ReDoS) via the split(/s*,s*/) operation on untrusted ETag headers. The vulnerable regular expression, which matches any number of whitespace characters around commas, can be exploited by an attacker sending a specially crafted, excessively long string of whitespace and commas in the ETag header. This can cause catastrophic backtracking in the regex engine, consuming massive amounts of CPU and resulting in a complete denial of service.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
sinatra is vulnerable to Inefficient Regular Expression Complexity in versions 1.2.7 - 4.1.1.
How to fix this
Upgrade the sinatra library to the patch version.
Links
Fix PRs
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