CVE-2026-72705Public exploit

Proof integrity bypass via untracked recursive calls

Published Aug 24, 2026 · Updated Aug 24, 2026

Logic flaw in the guard checker in Rocq Prover before 9.2.0 allows local users to admit false propositions through crafted definitions. The checker follows direct recursive calls but fails to track a fixpoint passed through another fixpoint argument, allowing its application to a non-subterm. Processing such a definition requires local user interaction and breaks proof soundness by accepting a closed proof of False without axioms or unsafe features.

CVSS severity6.8
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Logic flaw in the guard checker in Rocq Prover before 9.2.0 allows local users to admit false propositions through crafted definitions. The checker follows direct recursive calls but fails to track a fixpoint passed through another fixpoint argument, allowing its application to a non-subterm. Processing such a definition requires local user interaction and breaks proof soundness by accepting a closed proof of False without axioms or unsafe features.

The record

CVE
CVE-2026-72705
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
Rocq Prover
Product
Rocq Prover
Classifications
CWE-670
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <9.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Rocq Prover · Rocq Proverversion=0 <9.2.0

Published CVSS scores

6.8VulnCheck CNACVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
6.3VulnCheck CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-670Always-Incorrect Control Flow Implementation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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