Vulnerable Bitcoin Libraries Expose Apps to Excessive Miner Fees
Bitcoin applications risk incurring hefty miner fees due to flaws in two widely-used PSBT libraries.
Bitcoin applications risk incurring hefty miner fees due to flaws in two widely-used PSBT libraries. Bitcoin (BTC) is trading at $80,811.00. This is an original TLT brief based on reporting by CryptoSlate, with live market data added, as of Wed, 28 Oct 2026 06:45:03 UTC.
The flaws in these libraries could lead to significant financial losses for applications relying on them for fee calculations, impacting user trust and operational costs in the Bitcoin ecosystem.
- Two widely-used PSBT libraries contain bugs affecting fee calculations.
- Apps using these libraries may miss excessive fee warnings.
- Bitcoin network hashrate at 1070 EH/s, difficulty at 140.6T.
- Market cap $2.78T; Bitcoin price $80,811, up 1.26% in 24 hours.
- Bitcoin Network Activity Surges Despite Stagnant Miner Fees
- Vulnerable Bitcoin Libraries Expose Apps to Excessive Miner Fees — this brief
A critical vulnerability has been identified in two widely-used Partially Signed 
Bitcoin Transaction (PSBT) libraries, potentially causing applications to miscalculate miner fees. This flaw could lead to significantly higher transaction costs for users and developers who rely on these libraries for fee estimation.
The issue arises because the vulnerable libraries fail to properly account for fee calculations, which can result in applications missing warnings about excessive fees. This could lead to unintended financial losses and reduced user trust in affected applications.
The broader context involves the current state of the Bitcoin network, which has a hashrate of 1070 EH/s and a difficulty of 140.6T, indicating robust security and network activity. Despite this, the vulnerability highlights potential weaknesses in the tooling surrounding Bitcoin transactions.
The total cryptocurrency market cap stands at $2.78 trillion, with Bitcoin's price at $80,811, reflecting a 24-hour increase of 1.26%. The market's neutral Fear & Greed index at 51 suggests a balanced sentiment, but the fee vulnerability could introduce new uncertainties.
The discovery underscores the importance of rigorous testing and auditing of Bitcoin libraries. Developers and users should be vigilant and consider alternative libraries or updates to mitigate the risk of incurring excessive fees.
Since this brief published about 1 hour ago, Bitcoin (BTC) has moved from $80,811.00 to $80,811.00 — +0.00%.
The chart plots BTC's price: grey is the move before this brief published, the vertical dashed line marks the moment it published, the horizontal dashed line is the price then, and the coloured area is the move since — from TLT's market data (daily resolution). It shows what happened after the news, not that the news caused it; many factors move prices. Not financial advice.
Will Bitcoin reach $82,500 in October?
Crowd-implied probability on Polymarket, $93.38K 24h volume, resolves Nov 1 — snapshotted when this brief published (Oct 28 06:05 UTC). A market price reflects what traders collectively expect; it is not a forecast by TLT and will have moved since. View the market ↗
At today's peer-to-peer rate, 1 BTC ≈ ₦111.72M (about $80,811.00), up 1.5% over 24 hours. The naira itself trades about 2.1% above the official rate on the P2P market, so a Nigerian buyer's effective cost differs from the headline dollar price.
Live market data
Current prices for the asset in this story — live, source-stamped, updated every 15 minutes.
Figures and sectors in this story, checked live against on-chain aggregators · October 28, 2026.
TLT reads these figures directly from on-chain aggregators (DeFiLlama, mempool.space) at build time — independent of what any outlet reported. Sector totals aggregate every protocol DeFiLlama tracks in that category. Values are live and will change.
Vulnerable Bitcoin Libraries Expose Apps to Excessive Miner — questions & answers
What is the impact of the PSBT library vulnerability?
The vulnerability can cause applications to miscalculate miner fees, potentially leading to higher transaction costs and financial losses.
Which libraries are affected by the fee calculation bug?
The specific libraries are not named in the report, but they are described as widely-used PSBT libraries.
How can users protect themselves from this issue?
Users should ensure their applications use updated libraries and monitor fee calculations closely to avoid excessive charges.
How much is 1 Bitcoin worth in naira today?
About ₦111.72M at the live peer-to-peer (P2P) USDT rate, which is what Nigerians typically trade at — equivalent to roughly $80,811.00. The naira price moves with both BTC's US-dollar price and the USDT/NGN rate; use our Bitcoin in naira page for any amount.
Which outlets reported this story?
This is an original TLT brief that synthesises reporting from CryptoSlate. It is not a copy of any one article — follow the source links above for the original reporting.
Original summary — not financial advice. This is an original TLT brief that summarises a development reported elsewhere and adds live market data for context; it is not the original article and reproduces no part of it. Follow the source link above for full details. Crypto is volatile and high-risk — always do your own research.