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Offchain Labs Arbitrum Nitro External DA

Type

Security review

Client

Offchain Labs

Date

2026-01

Domain

Blockchain

Effort

4 wks

Section

Offchain Labs

Trail of Bits's security review of Offchain Labs (Jan 2026) identified 4 issues: 2 low, 1 informational, and 1 undetermined.

Findings · 4

  1. 1 Missing validations in executeValidatePreimage Undetermined
  2. 2 Missing sequencer message length checks Low
  3. 3 Unclear why the blob decode error is not being propagated Informational
  4. 4 Unclear behavior during sequencer message parsing Low

Findings extracted from the published report PDF. See the full report below for details and remediation.

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