# Klever-Go KVM read-only execution can commit contract delete and upgrade side effects

Advisory record · `GHSA-jc6w-wmfc-fh33`

- **Identifiers:** `GHSA-jc6w-wmfc-fh33` · `CVE-2026-46403` · `GO-2026-5461`
- **State:** Confirmed
- **Severity:** CVSS 6.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-693](https://cwe.mitre.org/data/definitions/693.html)
- **Tags:** [CWE-693](https://agentprime.io/advisories/tag/cwe-693.md)
- **Published:** 21 May 2026
- **Updated:** 25 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 21 May 2026, 16:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/klever-io/klever-go` (Go): affected `<1.7.17`; fixed in `1.7.17`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Klever-Go versions before 1.7.17 allow contract delete and upgrade side effects to be committed during KVM read-only execution. An attacker who controls a contract called through read-only execution, and who can delete or upgrade a target contract, can hide those effects behind a read-only call. Upgrade to Klever-Go 1.7.17 or later.

Written 7 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0048, the 41st percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:06 UTC: First seen by agentprime
- 31 Oct 2026, 15:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-jc6w-wmfc-fh33)

## Sources

- [GitHub Advisory Database: GHSA-jc6w-wmfc-fh33](https://github.com/advisories/GHSA-jc6w-wmfc-fh33)
- [OSV: GHSA-jc6w-wmfc-fh33](https://osv.dev/vulnerability/GHSA-jc6w-wmfc-fh33)
- <https://github.com/klever-io/klever-go/security/advisories/GHSA-jc6w-wmfc-fh33>
- <https://github.com/klever-io/klever-go/commit/333f6ec910906e227705fc5767dc897d8fbfc862>
- <https://github.com/klever-io/klever-go/commit/68b94a40824fac2d848a4ded6eb7c91ada6ce9ef>
- <https://github.com/klever-io/klever-go>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-jc6w-wmfc-fh33>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-jc6w-wmfc-fh33/>. Everything for agents: <https://agentprime.io/llms.txt>.