{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72705","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-08-10T13:02:52.001Z","datePublished":"2026-08-24T20:08:32.535Z","dateUpdated":"2026-08-29T11:47:44.348Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-08-29T11:47:44.348Z"},"datePublic":"2026-02-28T00:00:00.000Z","title":"Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument","descriptions":[{"lang":"en","value":"The guard checker in Rocq Prover does not follow recursive calls made through a fixpoint's own arguments. A fixpoint may pass itself as a higher-order argument to a second fixpoint, which then applies it to a value that is not a subterm of the structural argument. Passing the recursive function to a plain definition is rejected because the checker unfolds the definition and observes the call, but passing it to a fixpoint is accepted because higher-order recursive calls through fixpoint arguments are not tracked. This admits a type that is definitionally equal to its own negation, so self-application produces False in purely definitional code, without tactics, axioms, plugins or unsafe flags, and Print Assumptions reports the result as closed under the global context. Fixed in Rocq 9.2.0."}],"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-670","description":"Always-Incorrect Control Flow Implementation","type":"CWE"}]}],"affected":[{"vendor":"rocq-prover","product":"rocq","repo":"https://github.com/rocq-prover/rocq","packageURL":"pkg:github/rocq-prover/rocq","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"9.2.0","status":"affected","versionType":"custom"}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","baseScore":6.8,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N","baseScore":6.3,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"}}],"references":[{"url":"https://github.com/rocq-prover/rocq","tags":["product"]},{"url":"https://github.com/rocq-prover/rocq/issues/21683","tags":["issue-tracking"]},{"url":"https://github.com/rocq-prover/rocq/pull/21684","tags":["issue-tracking","patch"]},{"url":"https://github.com/endrazine/rocq-cve-poc-21683","tags":["exploit"]},{"name":"VulnCheck Advisory: Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/rocq-prover-before-guard-checker-accepts-fixpoint-passed-as-a-higher-order-argument"}],"credits":[{"lang":"en","value":"Tristan Stérin","type":"finder"},{"lang":"en","value":"Jonathan Brossard (MOABI)","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-26T15:46:51.503814Z","id":"CVE-2026-72705","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-26T16:13:14.137Z"}}]}}