# Serialization gadgets exploit in jackson-databind

Advisory record · `GHSA-r3gr-cxrf-hg25`

- **Identifiers:** `GHSA-r3gr-cxrf-hg25` · `CVE-2020-35491`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-502](https://cwe.mitre.org/data/definitions/502.html) · [CWE-913](https://cwe.mitre.org/data/definitions/913.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md) · [CWE-913](https://agentprime.io/advisories/tag/cwe-913.md)
- **Published:** 9 Dec 2021
- **Updated:** 25 Jun 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Dec 2021, 19:15 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 `>=2.0.0, <2.9.10.8`; fixed in `2.9.10.8`

## 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

- 8.1 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.077, the 94th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:13 UTC: First seen by agentprime
- 31 Oct 2026, 15:13 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-r3gr-cxrf-hg25)

## Sources

- [GitHub Advisory Database: GHSA-r3gr-cxrf-hg25](https://github.com/advisories/GHSA-r3gr-cxrf-hg25)
- [OSV: GHSA-r3gr-cxrf-hg25](https://osv.dev/vulnerability/GHSA-r3gr-cxrf-hg25)
- <https://nvd.nist.gov/vuln/detail/CVE-2020-35491>
- <https://github.com/FasterXML/jackson-databind/issues/2986>
- <https://github.com/FasterXML/jackson-databind/commit/41b8bdb5ccc1d8edb71acf1c8234da235a24249d>
- <https://cowtowncoder.medium.com/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062>
- <https://github.com/FasterXML/jackson-databind>
- <https://lists.debian.org/debian-lts-announce/2021/04/msg00025.html>
- <https://security.netapp.com/advisory/ntap-20210122-0005>
- <https://www.oracle.com//security-alerts/cpujul2021.html>
- <https://www.oracle.com/security-alerts/cpuApr2021.html>
- <https://www.oracle.com/security-alerts/cpuapr2022.html>
- <https://www.oracle.com/security-alerts/cpujan2022.html>
- <https://www.oracle.com/security-alerts/cpujul2022.html>

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-r3gr-cxrf-hg25>, 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-r3gr-cxrf-hg25/>. Everything for agents: <https://agentprime.io/llms.txt>.