Gravity Bridge in Cosmos Ecosystem Suffers $5.4 Million Theft Due to Key Leak

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Gravity Bridge in Cosmos Ecosystem Suffers $5.4 Million Theft Due to Key Leak

First seen 31 May 2026, 17:18 UTC • •66.0

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ThreatCluster •June 1, 2026 at 16:54 UTC

•Gravity Bridge lost approximately $5.4 million due to a signing key leak.
•The official team has suspended bridge services and requested validators to stop operations.
•Investigation into the incident is currently underway to determine the full scope of the attack.

The Gravity Bridge, a cross-chain bridge in the Cosmos ecosystem, has been attacked following the leakage of its signing keys. Approximately $5.4 million in assets were stolen as a result. The official team confirmed the security incident and has suspended bridge services for an investigation. Validators have been requested to halt the operation of validation nodes and coordinators. The incident highlights vulnerabilities in the management of signing keys within blockchain infrastructure. The exact method of the attack remains under investigation, but the compromise of contract keys is suspected. The situation is ongoing, with further updates expected as the investigation progresses.

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Timeline

2026-05-31

Gravity Bridge attack confirmed

The Gravity Bridge was confirmed to have been attacked, leading to the theft of $5.4 million in assets.

2026-05-31

Bridge services suspended

The official team suspended all bridging services to investigate the security incident.

2026-05-31

Validators requested to halt operations

Validators were asked to suspend the operation of validation nodes and coordinators as part of the response to the attack.

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2 entities, 1 inferred relationships (STIX 2.1).

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Technique (1)

Data Breach

Organization (1)

Gravity Bridge

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