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      <title>CVE-2026-72705 — Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-72705</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; rocq-prover rocq&lt;/p&gt;
&lt;p&gt;The guard checker in Rocq Prover does not follow recursive calls made through a fixpoint&amp;#39;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; rocq-prover rocq&lt;/p&gt;
&lt;p&gt;The guard checker in Rocq Prover does not follow recursive calls made through a fixpoint&amp;#39;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.&lt;/p&gt;</content:encoded>
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