Terra Classic Security Upgrade Completed: Why v4.0.1 Patch.3 Matters for LUNC

Terra Classic has successfully completed a major mandatory security upgrade, marking an important technical update for the LUNC network. The v4.0.1 patch.3 release was activated at block 30,544,730 on September 24, strengthening the network ahead of the planned public disclosure of a critical security vulnerability.

For LUNC holders, the upgrade does not mean exchanging tokens, moving funds to a new chain, or adopting new tokenomics. Instead, the update focuses on the software that runs the Terra Classic network and addresses a security vulnerability affecting key components of its smart contract platform.

The upgrade was estimated to occur at approximately 15:00 UTC on September 24, although the exact timing could vary depending on block production. The scheduled block height was 30,544,730.

Terra Classic Successfully Completes the Security Upgrade

The v4.0.1 patch.3 release was issued as a mandatory security update for Terra Classic, also known as the Columbus 5 network.

The update addresses a critical vulnerability affecting wasmd and wasmvm, components used by Terra Classic’s smart contract platform.

The vulnerability is being handled through responsible disclosure. Details of the fix are scheduled to be published by Cosmos Labs on September 28, 2026 at 14:00 UTC. The upgrade was therefore completed before the technical details become public.

This timing was important because infrastructure operators were expected to upgrade their software before the attack vector was publicly disclosed.

What Was Changed in the v4.0.1 Patch.3 Upgrade?

The main purpose of the update is security.

Terra Classic core maintainers applied the security fix to the terrad software and released v4.0.1 patch.3 as a mandatory upgrade.

The update is activated through the on chain software upgrade known as v14_3 at block 30,544,730.

The release also makes an important distinction for LUNC users.

The upgrade does not introduce a new token migration, new store, or parameter change. The official release notes state that the upgrade makes no state changes.

In simple terms, the update changes the network software to address the security issue without requiring LUNC holders to exchange their existing tokens.

Why Was the Upgrade Important?

1. It Addresses a Critical Security Vulnerability

The most important reason for the upgrade is protecting the network from a known security vulnerability.

The affected wasmd and wasmvm components are important parts of Terra Classic’s smart contract infrastructure. Applying the fix before the vulnerability details become public gives network operators an opportunity to update their systems before the attack information is widely available.

For a blockchain, this type of security maintenance is essential because vulnerabilities in core software can potentially affect applications and infrastructure operating on the network.

2. Validators and Infrastructure Providers Had to Upgrade

The update was not only relevant to validators.

All operators running a Columbus 5 node needed to upgrade. This includes validators, RPC and LCD providers, exchanges, relayers, and explorers. Nodes that did not upgrade were expected to stop at block 30,544,730 and could not continue processing the chain.

This makes the upgrade a network wide infrastructure event rather than a simple software update for individual LUNC holders.

3. The Network Could Resume After Validator Participation

After the upgrade height was reached, the network could resume block production once validators representing more than two thirds of voting power were running the new software.

This is an important part of how coordinated blockchain upgrades work.

Validators must run compatible software so the network can continue reaching consensus and producing blocks under the updated rules.

What Does This Mean for LUNC Holders?

For people who simply hold LUNC in a supported wallet, the upgrade does not require a token swap or migration.

There is no new LUNC version that holders need to exchange their tokens for.

The upgrade is primarily an infrastructure and software change.

Users may still experience temporary service interruptions if their exchange, wallet, explorer, or other service performs additional maintenance related to the upgrade.

For that reason, LUNC users should continue following announcements from the specific platforms they use.

Does the Upgrade Change LUNC Tokenomics?

No.

The v4.0.1 patch.3 security upgrade does not introduce a new tokenomics mechanism.

The official release specifically states that there is no migration, no new store, and no parameter change associated with the upgrade.

This means the primary focus is the security of the Terra Classic network software rather than changing the economic structure of LUNC.

Why September 28 Matters

The next important date is September 28, 2026.

Cosmos Labs is scheduled to publish details of the security fix at 14:00 UTC on that date. Terra Classic was required to upgrade before the public disclosure so that its network infrastructure would already be running the patched software.

This explains why the September 24 upgrade was treated as mandatory.

The network was given several days between the activation of the security fix and the planned public disclosure of the vulnerability details.

For the Terra Classic community, this creates an important security milestone: the network has moved to the patched software before the technical details are publicly available.

What Happens Next for Terra Classic?

With the v4.0.1 patch.3 upgrade completed, attention now shifts toward continued network operation and the upcoming public disclosure.

The key technical milestone was block 30,544,730, where the v14_3 software upgrade was activated.

The next major event is the planned September 28 disclosure from Cosmos Labs.

For validators, infrastructure providers, exchanges, and other services connected to Terra Classic, running the patched software remains essential for continued network compatibility.

For ordinary LUNC holders, there is no separate token migration associated with this upgrade.

The Bigger Picture for LUNC

A blockchain’s long term operation depends on more than market activity.

Security, software maintenance, validator participation, infrastructure support, and reliable network operation are also important parts of maintaining a functioning blockchain.

The successful v4.0.1 patch.3 upgrade represents a technical maintenance milestone for Terra Classic.

It does not directly determine the future price of LUNC, but it addresses an important network security issue and ensures that Terra Classic’s infrastructure is running the patched software ahead of the planned vulnerability disclosure.

The key takeaway is simple: Terra Classic has successfully completed its mandatory security upgrade, protecting the network ahead of the September 28 public disclosure of the vulnerability details.

For the LUNC community, the focus now turns to the continued operation of the network and the next technical developments following the upgrade.