On December 2025, yETH was exploited in a unsafe math, resulting in approximately $9M in losses. That makes the yETH exploit the 32nd largest DeFi incident out of 690 documented in our archive.
Attack Mechanics: How the yETH Unsafe Math Played Out
Exploit Class Applied to yETH
The yETH incident on December 1, 2025 is classified as a Unsafe Math. Use of raw arithmetic without SafeMath or checks lets values corrupt. In the full archive, yETH is 1 of 1 documented unsafe math incidents.
Impact & Recovery for yETH
yETH Loss Figure
The yETH exploit caused $9,000,000 in losses — a significant ($1M–$10M) incident and the 7th largest of 96 documented in 2025. This single incident represents 0.5% of all tracked losses that year.
Where yETH Sits Among Unsafe Math Attacks
Ranked by loss size, yETH is the 1st largest of 1 unsafe math incidents documented. That puts the yETH loss above the class average of $9M.
Timeline Since the yETH Incident
The yETH exploit occurred 4 months ago (134 days). The contract, its fork-block, and the attack transaction remain on-chain and forensically reproducible.
Primary Reference for yETH
Public post-mortem / on-chain analysis for the yETH incident: view source.
FAQ
How much did yETH lose?
The yETH exploit in December 2025 resulted in $9,000,000 in losses — the 7th largest of 96 DeFi incidents that year.
When did the yETH hack happen?
The yETH exploit was recorded on December 1, 2025 — 134 days ago.
What type of exploit hit yETH?
The yETH incident is classified as a Unsafe Math. Use of raw arithmetic without SafeMath or checks lets values corrupt.
How common is the Unsafe Math pattern seen at yETH?
Our archive contains 1 documented unsafe math incidents. The yETH incident is one of them.
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It offers a novel perspective on market liquidity, volatility, and participant behavior by interpreting market dynamics through temperature and entropy measures.
What is one of the innovative security protocols boosting blockchain's viability in finance?
Self-executing security protocols like 'Proof of Work', 'Proof of Stake', and 'Smart Contracts'.