While many believed that the old contracts had long been "sealed away," approximately 2 million dollars was quietly transferred from a group of payment contracts that had been abandoned. On June 18, 2026, Aztec Labs publicly stated that they were investigating a potential vulnerability incident, and the affected targets were not their current privacy layer products, but rather an old payment system that was launched in 2021 and disabled in 2022. This set of contracts, based on the Stage 2 Rollup architecture and labeled as "immutable," continued to run online after product iteration, with some user funds latching on for an extended period, only to now become targets for attackers. Complicating the situation, Aztec Labs no longer held the administrator keys for that system, rendering them unable to pause the contracts or patch vulnerabilities through upgrades, while they could only watch as this fund, linked to the abandoned product, was transferred from the immutable contracts. Details of the incident have not been fully disclosed, but it is enough to pierce a common but dangerous misconception: the retirement of a product or abandonment of a contract does not mean a safe liquidation; those "zombie contracts," untouched but still holding assets, are planting invisible mines on-chain that will eventually be triggered.

2 Million Dollars Transferred from Abandoned Payment Contracts

The affected were actually Aztec's early payment system that had been dormant for many years. In 2021, Aztec launched a payment product based on the Stage 2 Rollup architecture and deployed a set of smart contracts clearly described by the official as "immutable and unchangeable" to carry user balances in that privacy layer. As the technical roadmap iterated, this product was announced to be discontinued in 2022, with traffic and new users redirected to subsequent new versions; however, these early contracts remained online and could not be overwritten through upgrades. They continued to operate on-chain as "immutable versions."

The problem arose during this period of "neglect": after the product was discontinued, a portion of user funds remained trapped within these contracts, not fully withdrawn or liquidated. Until June 18, 2026, Aztec Labs publicly admitted that about 2 million dollars had been transferred from the immutable contracts tied to the abandoned payment product, and they no longer possessed the administrator keys to pause the system or upgrade the contracts, leaving them with no option but to passively respond to this potential vulnerability incident. For any developer or user believing that "discontinuation equals safe shutdown," the 2 million dollars leaking from the zombie contracts vividly illustrated how funds left dormant in immutable contracts could evolve into a real attack surface years later.

Double-Edged Sword After Admin Key Destruction

Returning to 2021, this payment product based on the Stage 2 Rollup architecture was marked as an "immutable version" at the design stage. Aztec Labs intended to exclude themselves from the position of "changing rules at any time": there was no upgrade entry, no backend switch, and user funds were entrusted to a logic written directly onto the blockchain rather than a team that could press the pause button at any moment. For a system emphasizing privacy and censorship resistance, such design could weaken single-point power, reduce concerns about "assets being moved away with a single click by the project team" or "rules being secretly altered," and made this early product look more like an irrevocable commitment at the time.

However, when this potential vulnerability incident emerged in 2026, the same architecture revealed another side: Aztec Labs clearly stated that they no longer held the administrator keys for the deprecated system, meaning they could not pause the system or upgrade the contracts. Consequently, when about 2 million dollars was transferred from these zombie contracts, the project team had no way to intervene directly in the flow of funds at the contract level, leaving them only able to investigate off-chain and watch on-chain. For privacy rollups, this double-edged sword is particularly sharp—one end is the trust foundation brought by permissionlessness and immutability, while the other end is the sense of helplessness when an old system becomes an attack entry due to a lack of any emergency control measures. Privacy rollups need to redefine boundaries between the promise of "permissionlessness" and emergency control in extreme cases; this will be an architectural issue that Aztec and similar projects cannot avoid in the future.

Zombie Contracts: Forgotten but Still Exposed

In this incident, the affected was not Aztec's current mainline product, but rather that old payment system based on the Stage 2 Rollup architecture, which had been discontinued in 2022. It was designed as an "immutable version," and the associated smart contracts continued to run online after the product halted, unable to be upgraded or taken offline, resulting in a portion of user funds remaining trapped within. Until about 2 million dollars was transferred from these contracts in 2026. The "zombie contracts" referred to in the community are precisely these remnants that were neglected in business yet technically could not truly exit: they are no longer maintained but still exposed on the public chain, continuing to accept calls and carry value.

The reason this incident sparked widespread discussion is that it brought a previously overlooked issue to the forefront: the moment a product announces its discontinuation, the contract does not automatically "die." When asset migration is insufficient and users do not completely liquidate, old contracts can become weak points under the accumulation of time, and the design lacking administrator keys, unable to pause or upgrade, leaves the project team with almost no remedial options years later. The notion that "deprecation does not equal safety" emphasizes that the true conclusion is not the downtime announced in the notice, but rather the moment when the last asset leaves these zombie contracts on-chain.

A New Chapter in the Security Story of Privacy Rollups

In the Ethereum ecosystem, Aztec Labs has always been regarded as one of the few core projects focusing on privacy layers. The early payment product based on the Stage 2 Rollup architecture was once seen as a demonstration project for "scalable privacy payments." Today, this system, launched in 2021 and discontinued in 2022 due to technical iteration, is brought back into the spotlight after being abandoned for years due to the exposure of vulnerabilities in zombie contracts. For a privacy project that has shifted to a new technical roadmap, the turmoil triggered by the old architecture in 2026 is hard not to be interpreted as a turning point in the narrative of the entire privacy rollup.

When security incidents occur in privacy and scalability solutions, the first to be affected are often the confidence of users and developers—even if the incident involved a product that had already been taken offline, rather than the current evolving scheme. According to AiCoin data, approximately 2 million dollars were transferred from the immutable contracts related to the deprecated payment product, while Aztec Labs no longer controlled the administrator keys and could not pause or upgrade the contracts. This concept of "final deployment" now appears to require new supporting measures: stricter deprecation processes, more enforced asset migration tools, and enhanced audit rhythms specifically targeting long-chain assets. The next chapter of privacy rollups may not only need to prove "they can be private, and they can scale," but also demonstrate that throughout the entire lifecycle of a product, they can provide predictable and governable security boundaries for assets.

Long-Term On-Chain Asset Governance from This Incident

The accident that took place on June 18, 2026, brought a product that was thought to have "turned the page" back to the center stage, reminding everyone that contract abandonment and business downtime do not equate to risks naturally diminishing over time. On the contrary, those old contracts labeled as "immutable" could potentially evolve into invisible mines as the attention of the team, administrator privileges, and even personnel structure shift. Aztec's payment product, which was launched in 2021 and discontinued in 2022, still has about 2 million dollars remaining in the related immutable contracts. Currently, the officials only acknowledge that they are "investigating potential vulnerabilities" but have not disclosed the method of attack, the identity of the attacker, or the whereabouts of the funds. They are forced to reveal another side of the original "final deployment": once the administrator keys are completely out of the picture, options to pause, upgrade, or enforce migration become nonviable, and the focus on security and governance is locked within those lines of on-chain bytecode. For all long-lived protocols pursuing "permissionlessness," this incident has placed the trade-offs of long-term on-chain asset governance in a more glaring position—whether to continue adhering to immutable contracts, frontloading all risks in the design and auditing phases, or to retain a few, strictly constrained intervention paths to deal with unforeseen structural vulnerabilities in the future. Observers need to continually track Aztec's investigation conclusions, whether new deprecation processes and asset migration standards will be proposed, and whether the community will seize this opportunity to push for a more systematic Ethereum governance framework applicable to zombie contracts and long-term assets.

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