CVE-2025-62370: Alloy Core Libraries DoS Vulnerability

CVE-2025-62370 Overview

CVE-2025-62370 is a denial-of-service vulnerability in the Alloy Core libraries, a foundational set of Rust crates used across the Ethereum ecosystem. The flaw resides in the alloy_dyn_abi::TypedData component, where malformed input passed to eip712_signing_hash() triggers an uncaught panic [CWE-248]. Attackers can submit crafted EIP-712 typed data to crash any Rust service that processes it. Network-facing software such as RPC endpoints, indexers, signers, and wallet backends are exposed because the panic can be triggered remotely without authentication. The maintainers patched the issue in alloy-dyn-abi versions 1.4.1 and backported the fix to 0.8.26.

Critical Impact

Remote attackers can crash Rust-based Ethereum services by sending malformed EIP-712 typed data, disrupting wallets, signers, RPC nodes, and other high-availability blockchain infrastructure.

Affected Products

• alloy-dyn-abi crate versions prior to 0.8.26 (0.x branch)
• alloy-dyn-abi crate versions prior to 1.4.1 (1.x branch)
• Rust applications consuming the Alloy Core libraries for Ethereum EIP-712 typed data processing

Discovery Timeline

• 2025-10-15 - CVE-2025-62370 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-62370

Vulnerability Analysis

The vulnerability stems from an uncaught panic [CWE-248] in the Alloy Core implementation of EIP-712 typed data hashing. The eip712_signing_hash() function in alloy_dyn_abi::TypedData accesses the first element of a collection without first verifying that the collection contains any elements. When an attacker supplies malformed TypedData input, the underlying indexing operation panics, terminating the Rust thread or process.

In services that process untrusted EIP-712 payloads, such as wallet backends, RPC providers, signing services, and indexers, this panic propagates and brings down the running instance. Software with high availability requirements is the primary target because each crafted request reliably terminates the affected component. External auto-restart mechanisms such as systemd or container orchestrators only partially mitigate the issue, since repeated requests reproduce the crash on every restart.

Root Cause

The root cause is missing input validation before an unchecked element access in TypedData handling. The original implementation assumed the relevant collection was non-empty when computing the EIP-712 signing hash. The upstream patch in commit 7823e9af8c20e9fcfb5360f5eafd891c457ebccf introduces an explicit emptiness check and returns a recoverable error instead of panicking on empty input.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker submits crafted JSON or structured EIP-712 typed data to any endpoint that calls eip712_signing_hash() on attacker-controlled input. Examples include wallet signing APIs, dApp backends, custody systems, and Rust-based Ethereum nodes that expose typed data verification. Each malformed payload causes the worker thread or process to abort, producing a denial-of-service condition.

No public proof-of-concept exploit code is available. For technical specifics, refer to the GitHub Security Advisory GHSA-pgp9-98jm-wwq2 and the corresponding RustSec Advisory RUSTSEC-2025-0073.

Detection Methods for CVE-2025-62370

Indicators of Compromise

• Unexpected process or thread termination logs from Rust services containing the string panicked at near references to alloy_dyn_abi or TypedData.
• Repeated service restarts by systemd, Kubernetes, or other supervisors immediately following inbound EIP-712 typed data requests.
• Spikes in malformed eth_signTypedData or custom EIP-712 verification requests from a small set of source addresses.

Detection Strategies

• Inventory Rust services and dependencies for the alloy-dyn-abi crate at versions below 0.8.26 or 1.4.x below 1.4.1 using cargo audit against the RustSec database.
• Enable Rust panic logging (RUST_BACKTRACE=1) and forward stderr to centralized logging so panics in eip712_signing_hash are searchable.
• Correlate application crash events with inbound API traffic to identify request patterns that trigger panics.

Monitoring Recommendations

• Alert on elevated rates of HTTP 5xx responses or connection resets from endpoints that accept EIP-712 typed data.
• Monitor container restart counts and process uptime for Rust-based Ethereum infrastructure components.
• Track cargo audit results in CI pipelines and fail builds when RUSTSEC-2025-0073 is reported.

How to Mitigate CVE-2025-62370

Immediate Actions Required

• Upgrade alloy-dyn-abi to version 1.4.1 for the 1.x branch or 0.8.26 for the 0.x branch and rebuild all dependent Rust binaries.
• Audit transitive dependencies with cargo tree -i alloy-dyn-abi to identify every workspace member that pulls in the vulnerable crate.
• Rate-limit and validate untrusted EIP-712 typed data at the application boundary until the upgrade is deployed.

Patch Information

The maintainers released the fix in commit 7823e9af8c20e9fcfb5360f5eafd891c457ebccf, which adds a non-empty check before accessing the first element and returns an error on empty input. The patched releases are available on crates.io: alloy-dyn-abi 1.4.1 and the backport alloy-dyn-abi 0.8.26.

Workarounds

• Wrap calls to eip712_signing_hash() in std::panic::catch_unwind so malformed input does not terminate worker threads.
• Validate EIP-712 types and message fields for required structure and non-empty arrays before passing input to Alloy.
• Deploy auto-restart supervisors and per-source rate limiting to reduce the impact of repeated panic-triggering requests.

# Configuration example: upgrade and verify the patched crate
cargo update -p alloy-dyn-abi --precise 1.4.1
cargo audit
cargo tree -i alloy-dyn-abi