# CVE-2019-16943: jackson-databind polymorphic typing issue > Attackers can execute arbitrary code via deserialization in jackson-databind when Default Typing is enabled and p6spy is present. - **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 1 Oct 2019 - **Updated:** 7 Oct 2026 - **Also known as:** CLEANSTART-2026-JD21089, DEBIAN-CVE-2019-16943, GHSA-fmmc-742q-jg75, ROOT-APP-MAVEN-CVE-2019-16943, UBUNTU-CVE-2019-16943 ## What is CVE-2019-16943? CVE-2019-16943 is a critical unsafe deserialization vulnerability in Debian Debian Linux, published on 1 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official 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 p6spy (3.8.6) 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 com.p6spy.engine.spy.P6DataSource mishandling. Weakness: CWE-502 (Deserialization of Untrusted Data) ## Which versions are affected by CVE-2019-16943? 6 open source packages ship an affected version, including com.fasterxml.jackson.core:jackson-databind. It affects 26 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `com.fasterxml.jackson.core:jackson-databind` | Maven | All versions | 2.6.7.3 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | All versions | 2.6.7.3 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.7.0 | 2.8.11.5 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.7.0 | 2.8.11.5 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.9.0 | 2.9.10.1 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.9.0 | 2.9.10.1 | Products: Debian Debian Linux, Fasterxml Jackson-Databind, Fedoraproject Fedora, Netapp Active Iq Unified Manager, Netapp Oncommand Api Services, Netapp Oncommand Workflow Automation, Netapp Service Level Manager, Netapp Steelstore Cloud Integrated Storage, Oracle Banking Platform, Oracle Communications Billing and Revenue Management, Oracle Communications Calendar Server, Oracle Communications Cloud Native Core Network Slice Selection Function, Oracle Communications Evolved Communications Application Server, Oracle Global Lifecycle Management Nextgen Oui Framework, Oracle Goldengate Application Adapters, Oracle Jd Edwards Enterpriseone Orchestrator, Oracle Jd Edwards Enterpriseone Tools, Oracle Primavera Gateway, Oracle Retail Merchandising System, Oracle Retail Sales Audit and 6 more. ## How do I fix CVE-2019-16943? Upgrade com.fasterxml.jackson.core:jackson-databind to a fixed version for your release line: 2.6.7.3, 2.8.11.5 or 2.9.10.1. ## Is CVE-2019-16943 being exploited? There is no known exploitation of CVE-2019-16943 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2019-16943 and fix it if it is affected. What it is: CVE-2019-16943 is a critical unsafe deserialization vulnerability in Debian Debian Linux, published on 1 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2019-16943 in the wild and no public exploit code. Affected packages and fixed versions: - com.fasterxml.jackson.core:jackson-databind (Maven): affected all versions; fixed in 2.6.7.3 - com.fasterxml.jackson.core:jackson-databind (Maven): affected all versions; fixed in 2.6.7.3 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.7.0; fixed in 2.8.11.5 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.7.0; fixed in 2.8.11.5 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.9.0; fixed in 2.9.10.1 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.9.0; fixed in 2.9.10.1 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2019-16943/ (Markdown: https://insights.sbomify.com/CVE-2019-16943/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-16943 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-16943 - OSV: https://osv.dev/vulnerability/CVE-2019-16943 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-16943/ Summaries are generated and may contain mistakes; the official description above is the record.