Is CVE-2026-72704 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-72704 being exploited in the wild.

How severe is CVE-2026-72704?

Medium severity, with a CVSS score of 6.3, published 24 August 2026.

Which products and versions are affected?

Rocq Prover Project Rocq Prover ≤ 9.2.0.

Is there a fix for CVE-2026-72704?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-72704 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-72704?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-72704: Rocq Prover guard checker rectree corruption

CVE-2026-72704 · Severity: medium · CVSS 6.3 · Published 2026-08-24

Rocq Prover is an interactive theorem prover used for formal verification of mathematical proofs and software correctness. A flaw in its guard checker (which validates that recursive functions terminate) allows attackers to prove false statements by corrupting the internal recursion tracking mechanism. An exploit can demonstrate that 0 equals 1, undermining the logical soundness of any formal proof that relies on this component.

Quick answers

Is CVE-2026-72704 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-72704 being exploited in the wild.
How severe is CVE-2026-72704?: Medium severity, with a CVSS score of 6.3, published 24 August 2026.
Which products and versions are affected?: Rocq Prover Project Rocq Prover ≤ 9.2.0.
Is there a fix for CVE-2026-72704?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-72704 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-72704?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The guard checker in Rocq Prover fails to recheck the rectree (recursion tree representation) of inductive type parameters after they are modified through transport operations (type rewrites). A fixpoint can silently corrupt the rectree by applying a rewrite to its recursive argument; when a second fixpoint calls the first, it inherits the corrupted rectree without re-verification, leading the guard checker to incorrectly accept non-terminating definitions as structurally decreasing. The exploit uses two axioms consistent with univalence and the calculus of inductive constructions, then constructs a non-terminating function that produces the contradiction 0=1. The root cause is CWE-670 (control flow implementation error), and no public patch has been merged as of the advisory date.

Affected products

Rocq Prover Project Rocq Prover ≤ 9.2.0

Timeline

2026-08-24: disclosed
2026-08-24: advisory

References

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