# jackson-databind: \`@JsonView\` bypass for creator properties with \`@JsonTypeInfo(include=As.EXTERNAL_PROPERTY)\`

Advisory record · `GHSA-mhm7-754m-9p8w`

- **Identifiers:** `GHSA-mhm7-754m-9p8w`
- **State:** Confirmed
- **Severity:** CVSS 6.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-863](https://cwe.mitre.org/data/definitions/863.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 21 Jul 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 21 Jul 2026, 19:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `com.fasterxml.jackson.core:jackson-databind` (Maven): affected `>=2.18.0, <2.18.9 || >=2.21.0, <2.21.5`; fixed in `2.18.9`, `2.21.5`

## 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

- 6.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-mhm7-754m-9p8w)

## Sources

- [GitHub Advisory Database: GHSA-mhm7-754m-9p8w](https://github.com/advisories/GHSA-mhm7-754m-9p8w)
- [OSV: GHSA-mhm7-754m-9p8w](https://osv.dev/vulnerability/GHSA-mhm7-754m-9p8w)
- <https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-mhm7-754m-9p8w>
- <https://github.com/FasterXML/jackson-databind/commit/c628b357ed143d8492756d5c1458cfb9fbeb29ed>
- <https://github.com/FasterXML/jackson-databind/commit/dea7eb466e98cc226c4ac65587581fb49926820c>
- <https://github.com/FasterXML/jackson-databind>

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-mhm7-754m-9p8w>, 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-mhm7-754m-9p8w/>. Everything for agents: <https://agentprime.io/llms.txt>.