{"id":"CVE-2026-46403","aliases":["GHSA-jc6w-wmfc-fh33","GO-2026-5461"],"url":"https://o3.security/vulnerability/CVE-2026-46403","summary":"Klever-Go KVM read-only execution can commit contract delete and upgrade side effects","details":"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.","published":"2026-07-21T19:51:18.745Z","modified":"2026-08-12T03:51:25.944562363Z","cvss":{"score":6.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N"},"epss":{"score":0.00342,"percentile":0.27227,"asOf":"2026-08-18"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/klever-io/klever-go","fixedVersion":"1.7.17"}],"fix":{"url":"https://github.com/klever-io/klever-go/commit/333f6ec910906e227705fc5767dc897d8fbfc862","label":"klever-io/klever-go@333f6ec"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46403.json"},{"type":"ADVISORY","url":"https://github.com/klever-io/klever-go/security/advisories/GHSA-jc6w-wmfc-fh33"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46403"},{"type":"FIX","url":"https://github.com/klever-io/klever-go/commit/333f6ec910906e227705fc5767dc897d8fbfc862"},{"type":"FIX","url":"https://github.com/klever-io/klever-go/commit/68b94a40824fac2d848a4ded6eb7c91ada6ce9ef"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:25.944562363Z"}}