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Post Mortem: Onyx Protocol

ID: 1efac9d7-1a20-56e3-a857-9a63c7c630d7

STIX ID: report--1efac9d7-1a20-56e3-a857-9a63c7c630d7

Feed Name: CertiK Blog

Threat Score
70/100

Date Published: 2024-01-07

Date Updated: 2026-06-11

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**On Nov 1, 2023, Onyx Protocol lost about $2.1M after an attacker manipulated the exchange rate of a newly added PEPE market (which had no initial liquidity) and exploited a rounding error to redeem nearly all collateral; the vulnerability had been identified in a prior CertiK audit and a fix was recommended but not applied.**

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