---
id: CVE-2020-37268
title: >-
  Print Assumptions does not report that a definition was produced while
  universe checking was disabled when that definition reaches the caller through
  Parameter Inline in a module type
summary: >-
  Print Assumptions does not report that a definition was produced while
  universe checking was disabled when that definition reaches the caller through
  Parameter Inline in a module type. Applying a functor inlines the body of the
  parameter…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N'
cwe:
  - CWE-778
published: '2026-08-24'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:23:49.880'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-37268'
references:
  - url: 'https://github.com/endrazine/rocq-cve-poc-12155'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/rocq-prover/rocq'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/rocq-prover/rocq/blob/master/dev/doc/critical-bugs.md'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/rocq-prover/rocq/issues/12155'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/coq-and-rocq-prover-print-assumptions-omits-unsafe-universe-checking-inlined-through-parameter-inline
    label: disclosure@vulncheck.com
  - url: 'https://github.com/rocq-prover/rocq/issues/12155'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00183
epssPercentile: 0.07033
ingestedAt: '2026-09-08T21:11:12.285Z'
vendor: rocq-prover
product: rocq
affected:
  - rocq >= 8.11 <= 9.2.0
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-25T15:10:38.394659Z'
---

## Overview

Print Assumptions does not report that a definition was produced while universe checking was disabled when that definition reaches the caller through Parameter Inline in a module type. Applying a functor inlines the body of the parameter, and the inlining drops the record that the term was built under Unset Universe Checking, so the resulting constant carries no trace of the unsafe operation. A module implementation can therefore prove False using a universe inconsistency, expose it through an inlined parameter, and have Print Assumptions report the dependent proof as closed under the global context. Because Print Assumptions is the in-process audit used to confirm that a development rests on no unexpected assumptions, a dependency built this way passes that audit while proving arbitrary propositions. The standalone checker coqchk does reject the resulting compiled file. The project records this in dev/doc/critical-bugs.md under non-fixed bugs and rates the risk as moderate when coqchk is not used.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.