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CVE-2026-72705— Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument

Quick assessment

Affected
rocq-prover rocq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Rocq Prover是Rocq Prover组织的一个形式化证明辅助软件。 Rocq Prover 9.2.0之前版本存在处理逻辑错误漏洞，该漏洞源于guard checker未跟踪通过fixpoint自身参数进行的高阶递归调用，可能导致类型定义性等价于其自身否定，从而在纯定义性代码中产生False。

CVSS 6.3 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
rocq-prover rocq < 9.2.0 affected
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I. Basic Information for CVE-2026-72705

Vulnerability Information
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Vulnerability Title
Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
控制流实现总是不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Rocq Prover 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rocq Prover是Rocq Prover组织的一个形式化证明辅助软件。 Rocq Prover 9.2.0之前版本存在处理逻辑错误漏洞，该漏洞源于guard checker未跟踪通过fixpoint自身参数进行的高阶递归调用，可能导致类型定义性等价于其自身否定，从而在纯定义性代码中产生False。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rocq-prover rocq 0 ~ 9.2.0 -

II. Public POCs for CVE-2026-72705

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III. Intelligence Information for CVE-2026-72705

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Patches & Fixes for CVE-2026-72705 (1)

Proof of Concept for CVE-2026-72705 (1)

News Coverage for CVE-2026-72705 (1)

Other References for CVE-2026-72705 (2)

Same Patch Batch · rocq-prover · 2026-08-24 · 5 CVEs total

CVE-2026-72714 6.3 MEDIUM Rocq Prover through 9.2.0 Universe Checking State Desynchronised After Module Close
CVE-2026-72703 6.3 MEDIUM Rocq Prover 8.20 before 9.2.0 Guard Checker Accepts Non-Terminating Fixpoint via Unchecked
CVE-2026-72704 6.3 MEDIUM Rocq Prover through 9.2.0 Guard Checker Trusts Corrupted Recursive Tree After Transport
CVE-2020-37268 6.3 MEDIUM Coq and Rocq Prover Print Assumptions Omits Unsafe Universe Checking Inlined Through Param

IV. Related Vulnerabilities

Same product: rocq
Same vendor: rocq-prover
Same weakness: CWE-670

V. Comments for CVE-2026-72705

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