AIKIDO-2026-878974
google-adk is vulnerable to Regular Expression Denial of Service (ReDoS)
59
Medium Risk
This Affects:
google-adkTL;DR
The google-adk code executor extracts code blocks from model response text using a regular expression that combines nested lazy wildcards with DOTALL matching. When a response contains an opening code-block delimiter but no matching trailing delimiter, the pattern enters catastrophic backtracking that scales quadratically with the input length. Processing a large delimiter-free or unterminated response then consumes CPU for an extended period and stalls the agent turn, blocking execution and bypassing configured timeouts. The fix replaces the regular expression with a linear string search that locates delimiters without backtracking.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your agents use a code executor that processes large or untrusted model responses.
Background info
google-adk is vulnerable to Regular Expression Denial of Service (ReDoS) in versions 0.0.2 - 2.2.0.
How to fix this
Upgrade the google-adk library to the patch version.
Are You Affected?
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