CVE-2020-37268: medium-severity vulnerability in rocq-prover rocq
Coq and Rocq Prover Print Assumptions Omits Unsafe Universe Checking Inlined Through Parameter Inline
Published · Updated
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33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.8epss 0.2%
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.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Affected products
rocq-prover · rocqpublic PoCs found — 1
cve_referencegithub.com/endrazine/rocq-cve-poc-12155★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — rocq-prover rocq
In the same product, most dangerous first.
CVE-2026-72714MEDIUMRocq Prover through 9.2.0 Universe Checking State Desynchronised After Module CloseEPSS 0.2%CVE-2026-72705MEDIUMRocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order ArgumentEPSS 0.2%CVE-2026-72704MEDIUMRocq Prover through 9.2.0 Guard Checker Trusts Corrupted Recursive Tree After TransportEPSS 0.2%CVE-2026-72703MEDIUMRocq Prover 8.20 before 9.2.0 Guard Checker Accepts Non-Terminating Fixpoint via Unchecked Cross-CallsEPSS 0.2%
References
https://github.com/endrazine/rocq-cve-poc-12155https://github.com/rocq-prover/rocqhttps://github.com/rocq-prover/rocq/blob/master/dev/doc/critical-bugs.mdhttps://github.com/rocq-prover/rocq/issues/12155https://www.vulncheck.com/advisories/coq-and-rocq-prover-print-assumptions-omits-unsafe-universe-checking-inlined-through-parameter-inlinehttp://www.openwall.com/lists/oss-security/2026/10/26/8