# Kysely: JSON-path traversal injection via unsanitized path-leg metacharacters in \`JSONPathBuilder.key()\` / \`.at()\`

Advisory record · `GHSA-pv5w-4p9q-p3v2`

- **Identifiers:** `GHSA-pv5w-4p9q-p3v2` · `CVE-2026-44635`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-89](https://cwe.mitre.org/data/definitions/89.html) · [CWE-915](https://cwe.mitre.org/data/definitions/915.html) · [CWE-1284](https://cwe.mitre.org/data/definitions/1284.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md) · [SQL injection](https://agentprime.io/advisories/tag/sql-injection.md) · [Broken access control](https://agentprime.io/advisories/tag/access-control.md) · [CWE-1284](https://agentprime.io/advisories/tag/cwe-1284.md)
- **Published:** 11 May 2026
- **Updated:** 9 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 May 2026, 19:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `kysely` (npm): affected `>=0.26.0, <0.28.17`; fixed in `0.28.17`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0036, the 30th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 11 May 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-pv5w-4p9q-p3v2](https://github.com/advisories/GHSA-pv5w-4p9q-p3v2)
- [OSV: GHSA-pv5w-4p9q-p3v2](https://osv.dev/vulnerability/GHSA-pv5w-4p9q-p3v2)
- <https://github.com/kysely-org/kysely/security/advisories/GHSA-pv5w-4p9q-p3v2>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-44635>
- <https://github.com/kysely-org/kysely>
- <https://github.com/kysely-org/kysely/releases/tag/v0.28.17>

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-pv5w-4p9q-p3v2>, 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-pv5w-4p9q-p3v2/>. Everything for agents: <https://agentprime.io/llms.txt>.