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CVE-2026-72703— Rocq Prover 8.20 before 9.2.0 Guard Checker Accepts Non-Terminating Fixpoint via Unchecked Cross-Calls

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 8.20版本至9.2.0之前版本存在处理逻辑错误漏洞，该漏洞源于guard checker在处理嵌套互递归fixpoint时未检查不同主体之间的调用，将参数错误视为uniform，导致非终止定义被接受为结构递减，可能使攻击者证明任意命题。

CVSS 6.3 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1588.001 · Malware

Affected Version Matrix 1

VendorProduct Version RangeStatus
rocq-prover rocq 8.20< 9.2.0 affected
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I. Basic Information for CVE-2026-72703

Vulnerability Information
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Vulnerability Title
Rocq Prover 8.20 before 9.2.0 Guard Checker Accepts Non-Terminating Fixpoint via Unchecked Cross-Calls
Source: CVE Program / CVE List V5
Vulnerability Description
The guard checker in Rocq Prover treats a parameter of a nested mutual fixpoint as uniform without examining calls between the different bodies of that fixpoint. find_uniform_parameters in kernel/inductive.ml inspects only self-recursive calls, so when no body calls itself the function concludes that every parameter is uniform. A parameter that grows through a cross-call from one body to another therefore keeps the subterm specification it inherited from the enclosing fixpoint, and a recursive call guarded by that specification is accepted although the argument is not structurally smaller. A non-terminating definition is admitted as structurally decreasing, which yields a term whose value equals its own successor and so a proof of False, from which any proposition follows. The proof requires no axioms, plugins or unsafe flags and Print Assumptions reports it as closed under the global context. Introduced in Coq 8.20 and 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 8.20版本至9.2.0之前版本存在处理逻辑错误漏洞，该漏洞源于guard checker在处理嵌套互递归fixpoint时未检查不同主体之间的调用，将参数错误视为uniform，导致非终止定义被接受为结构递减，可能使攻击者证明任意命题。
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 8.20 ~ 9.2.0 -

II. Public POCs for CVE-2026-72703

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III. Intelligence Information for CVE-2026-72703

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Patches & Fixes for CVE-2026-72703 (1)

Vendor Advisories for CVE-2026-72703 (1)

News Coverage for CVE-2026-72703 (1)

Other References for CVE-2026-72703 (1)

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

CVE-2026-72705 6.3 MEDIUM Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument
CVE-2026-72714 6.3 MEDIUM Rocq Prover through 9.2.0 Universe Checking State Desynchronised After Module Close
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-2026-72703

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