AIKIDO-2025-10565
aiogram is vulnerable to Observable Timing Discrepancy
15
Low Risk
This Affects:
aiogramTL;DR
Affected versions of this package are vulnerable to observable timing discrepancies in signature validation. The utils.web_app module compares the calculated HMAC with the provided hash using ==, which can inadvertently leak timing information and expose the application to timing attacks. While verification still functions correctly, the non-constant-time comparison creates a side channel risk. The patch replaces == with hmac.compare_digest, ensuring constant-time comparison and mitigating potential timing-based exploits.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
aiogram is vulnerable to Observable Timing Discrepancy in versions 3.0.0 - 3.21.0.
How to fix this
Upgrade the aiogram library to the patch version.
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