CVE-2026-72705
Rocq Prover before 9.2.0 Guard Checker Accepts Fixpoint Passed as a Higher-Order Argument
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.
INFO
Published Date :
Aug. 24, 2026, 8:17 p.m.
Last Modified :
Oct. 26, 2026, 2:17 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update Rocq Prover to version 9.2.0.
- Apply any subsequent security patches.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72705.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72705 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72705
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72705 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72705 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Oct. 26, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/10/26/6 -
CVE Translated by [email protected]
Oct. 12, 2026
Action Type Old Value New Value Added Translation Title: Rocq de Rocq Prover, Description: El verificador de guardas en Rocq Prover no sigue las llamadas recursivas realizadas a través de los propios argumentos de un punto fijo. Un punto fijo puede pasarse a sí mismo como un argumento de orden superior a un segundo punto fijo, el cual luego lo aplica a un valor que no es un subtérmino del argumento estructural. Pasar la función recursiva a una definición simple es rechazado porque el verificador despliega la definición y observa la llamada, pero pasarlo a un punto fijo es aceptado porque las llamadas recursivas de orden superior a través de argumentos de punto fijo no son rastreadas. Esto admite un tipo que es definicionalmente igual a su propia negación, por lo que la autoaplicación produce Falso en código puramente definicional, sin tácticas, axiomas, plugins o flags inseguros, y Print Assumptions informa el resultado como cerrado bajo el contexto global. Corregido en Rocq 9.2.0. -
CVE Modified by [email protected]
Aug. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/endrazine/rocq-cve-poc-21683 Added Reference https://github.com/rocq-prover/rocq Added Reference https://github.com/rocq-prover/rocq/issues/21683 Added Reference https://github.com/rocq-prover/rocq/pull/21684 Added Reference https://www.vulncheck.com/advisories/rocq-prover-before-guard-checker-accepts-fixpoint-passed-as-a-higher-order-argument Removed Reference https://github.com/endrazine/rocq-cve-poc-21683 Removed Reference https://github.com/rocq-prover/rocq Removed Reference https://github.com/rocq-prover/rocq/issues/21683 Removed Reference https://github.com/rocq-prover/rocq/pull/21684 Removed Reference https://www.vulncheck.com/advisories/rocq-prover-before-guard-checker-accepts-fixpoint-passed-as-a-higher-order-argument -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 26, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-72705', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-26T15:46:51.503814Z'} -
New CVE Received by [email protected]
Aug. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/rocq-prover/rocq', 'vendor': 'rocq-prover', 'product': 'rocq', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '9.2.0', 'versionType': 'custom'}], 'packageURL': 'pkg:github/rocq-prover/rocq', 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N Added CWE CWE-670 Added Reference https://github.com/endrazine/rocq-cve-poc-21683 Added Reference https://github.com/rocq-prover/rocq Added Reference https://github.com/rocq-prover/rocq/issues/21683 Added Reference https://github.com/rocq-prover/rocq/pull/21684 Added Reference https://www.vulncheck.com/advisories/rocq-prover-before-guard-checker-accepts-fixpoint-passed-as-a-higher-order-argument