# CVE-2025-54873: RISC Zero Underconstrained Vulnerability: Division

Source: https://junglewise.ai/threats/cve-2025-54873-risc-zero-underconstrained-vulnerability-division  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-08-05  
License: CC BY 4.0 with a link back

CVE-2025-54873 · Severity: medium · CVSS 4 · Published 2025-08-05

RISC Zero Underconstrained Vulnerability: Division

Technologies: [risc0-zkvm (crates.io)](https://junglewise.ai/threats/technologies/risc0-zkvm). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2025-54873 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-54873 being exploited in the wild.

**How severe is CVE-2025-54873?** Medium severity, with a CVSS score of 4, published 5 August 2025.

**Which products and versions are affected?** risc0-circuit-rv32im (crates.io) SEMVER:introduced=2.0.0,fixed=3.0.0; risc0-circuit-rv32im-sys (crates.io) SEMVER:introduced=2.0.0,fixed=3.0.0; risc0-zkvm (crates.io) SEMVER:introduced=2.0.0,fixed=2.2.0.

**Is there a fix for CVE-2025-54873?** Yes. risc0-circuit-rv32im (crates.io): upgrade to 3.0.0 or later; risc0-circuit-rv32im-sys (crates.io): upgrade to 3.0.0 or later; risc0-zkvm (crates.io): upgrade to 2.2.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-54873?** Check whether you run risc0-circuit-rv32im (crates.io), risc0-circuit-rv32im-sys (crates.io) or risc0-zkvm (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- risc0-circuit-rv32im (crates.io): upgrade to 3.0.0 or later

  ```sh
  cargo update -p risc0-circuit-rv32im
  ```

- risc0-circuit-rv32im-sys (crates.io): upgrade to 3.0.0 or later

  ```sh
  cargo update -p risc0-circuit-rv32im-sys
  ```

- risc0-zkvm (crates.io): upgrade to 2.2.0 or later

  ```sh
  cargo update -p risc0-zkvm
  ```


## Affected products

- risc0-circuit-rv32im (crates.io) SEMVER:introduced=2.0.0,fixed=3.0.0
- risc0-circuit-rv32im-sys (crates.io) SEMVER:introduced=2.0.0,fixed=3.0.0
- risc0-zkvm (crates.io) SEMVER:introduced=2.0.0,fixed=2.2.0

## Identifiers

- CVE-2025-54873
- GHSA-f6rc-24x4-ppxp

## Related threats

- [risc0 vulnerable to arbitrary code execution in guest via memory safety failure in `sys_read`](https://junglewise.ai/threats/cve-2025-61588-risc0-vulnerable-to-arbitrary-code-execution-in-guest-via-memory)
- [zkVM Underconstrained Vulnerability](https://junglewise.ai/threats/cve-2025-52484-zkvm-underconstrained-vulnerability)
- [RISC Zero zkVM notes on zero-knowledge](https://junglewise.ai/threats/risc-zero-zkvm-notes-on-zero-knowledge-a5daa959)