CVE-2026-72704Public exploit

Proof-integrity compromise via unchecked recursive-tree transport

Published Aug 24, 2026 · Updated Aug 25, 2026

Improper guard checking in Rocq Prover 9.2.0 and earlier allows local users to compromise proof integrity via crafted fixpoints. The guard checker preserves an inductive type across transport but fails to recheck its altered recursive tree, so a nested fixpoint is accepted as decreasing. Exploitation requires processing a proof that uses univalence-consistent axioms and yields False, allowing any proposition to follow.

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

Improper guard checking in Rocq Prover 9.2.0 and earlier allows local users to compromise proof integrity via crafted fixpoints. The guard checker preserves an inductive type across transport but fails to recheck its altered recursive tree, so a nested fixpoint is accepted as decreasing. Exploitation requires processing a proof that uses univalence-consistent axioms and yields False, allowing any proposition to follow.

The record

CVE
CVE-2026-72704
Published
Aug 24, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
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 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
6.3VulnCheckCVSS: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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