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CVE-2020-37268— Coq and Rocq Prover Print Assumptions Omits Unsafe Universe Checking Inlined Through Parameter Inline

Quick assessment

Affected
rocq-prover rocq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

未报告在禁用宇宙检查（universe checking）时产生的定义，因为该定义通过模块类型（module type）中的参数内联（Parameter Inline）传递给了调用方。当对 functor 进行应用时，参数的主体会被内联，且内联过程会丢弃“该项是在关闭宇宙检查的情况下构建的”这一记录，导致生成的常量不再带有执行不安全操作的痕迹。因此，模块实现可以利用宇宙不一致性（universe inconsistency）证明 ，并通过内联的参数将其暴露出来，使 将该依赖证明报告为在全局上下文下的闭合证明。由于

CVSS 6.3 · Medium EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
rocq-prover rocq 8.11≤ 9.2.0 affected
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I. Basic Information for CVE-2020-37268

Vulnerability Information
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Vulnerability Title
Coq and Rocq Prover Print Assumptions Omits Unsafe Universe Checking Inlined Through Parameter Inline
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的日志记录
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rocq-prover rocq 8.11 ~ 9.2.0 -

II. Public POCs for CVE-2020-37268

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III. Intelligence Information for CVE-2020-37268

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Vendor Advisories for CVE-2020-37268 (1)

Proof of Concept for CVE-2020-37268 (1)

Other References for CVE-2020-37268 (2)

Same Patch Batch · rocq-prover · 2026-08-24 · 5 CVEs total

CVE-2026-72705 6.3 MEDIUM Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument
CVE-2026-72714 6.3 MEDIUM Rocq Prover through 9.2.0 Universe Checking State Desynchronised After Module Close
CVE-2026-72703 6.3 MEDIUM Rocq Prover 8.20 before 9.2.0 Guard Checker Accepts Non-Terminating Fixpoint via Unchecked
CVE-2026-72704 6.3 MEDIUM Rocq Prover through 9.2.0 Guard Checker Trusts Corrupted Recursive Tree After Transport

IV. Related Vulnerabilities

Same product: rocq
Same vendor: rocq-prover
Same weakness: CWE-778

V. Comments for CVE-2020-37268

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