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EPSS 0.4%top 63%

CVE-2026-46403: CWE-693: Protection Mechanism Failure in klever-io klever-go

0
Medium
VulnerabilityCVE-2026-46403cvecve-2026-46403cwe-693
Published: 07/21/2026 (07/21/2026, 19:51:18 UTC)
Source: CVE Database V5
Vendor/Project: klever-io
Product: klever-go

Description

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.17, KVM exposes `ExecuteReadOnlyWithTypedArguments` as a read-only execution mechanism. The hook saves the previous read-only state, sets `runtime.SetReadOnly(true)`, executes the destination context, and then restores the previous read-only state. However, the indirect contract delete and upgrade paths do not reject execution when `runtime.ReadOnly()` is true. As a result, a contract reached through read-only execution can call the production delete hook for a target contract it owns. The delete path appends the target address to `vmOutput.DeletedAccounts`, the output context merges `DeletedAccounts` into the caller output, and the smart contract processor later processes the VM output by deleting accounts listed in that field. The root cause is that read-only mode is applied as runtime state, but not enforced by the state-changing delete and upgrade host-core paths. This breaks the expected isolation boundary for workflows that rely on read-only calls to inspect another contract without allowing that callee to produce state-changing VM output. The issue is fixed in v1.7.17. Contract delete and upgrade host-core paths now reject execution when `runtime.ReadOnly()` is true. The invariant is regression-tested for delete, upgrade, storage writes, value transfers, and any VM output field that can later mutate chain state.

CVSS v3.1

Score 6.3medium

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

Affected software

github.com/klever-io/klever-go
pkg:golang/github.com/klever-io/klever-go
Affected versions
<1.7.17

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Data Version
5.2
Assigner Short Name
GitHub_M
Date Reserved
2026-05-13T21:04:10.932Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a5fd4a41010f89cc224946a

Added to database: 07/21/2026, 20:20:52 UTC

Last enriched: 07/21/2026, 20:37:07 UTC

Last updated: 08/27/2026, 10:52:09 UTC

Views: 41

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