# CVE-2020-8840: Deserialization of Untrusted Data in jackson-databind > Attackers can achieve remote code execution via unsafe deserialization of JNDI objects in the Jackson databind library. - **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:** 10 Feb 2020 - **Updated:** 8 Oct 2026 - **Also known as:** CLEANSTART-2026-JE84381, DEBIAN-CVE-2020-8840, GHSA-4w82-r329-3q67, ROOT-APP-MAVEN-CVE-2020-8840, UBUNTU-CVE-2020-8840 ## What is CVE-2020-8840? CVE-2020-8840 is a critical unsafe deserialization vulnerability in Debian Debian Linux, published on 10 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description FasterXML jackson-databind 2.0.0 through 2.9.10.2 lacks certain xbean-reflect/JNDI blocking, as demonstrated by org.apache.xbean.propertyeditor.JndiConverter. Weakness: CWE-502 (Deserialization of Untrusted Data) ## Which versions are affected by CVE-2020-8840? 8 open source packages ship an affected version, including com.fasterxml.jackson.core:jackson-databind. It affects 8 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.0.0 | 2.6.7.4 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.0.0 | 2.6.7.4 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.7.0 | 2.7.9.7 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.7.0 | 2.7.9.7 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.8.0 | 2.8.11.5 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.8.0 | 2.8.11.5 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.9.0 | 2.9.10.3 | | `com.fasterxml.jackson.core:jackson-databind` | Maven | From 2.9.0 | 2.9.10.3 | Products: Debian Debian Linux, Fasterxml Jackson-Databind, Huawei Oceanstor 9000 Firmware, Netapp Oncommand Api Services, Netapp Oncommand Workflow Automation, Netapp Service Level Manager, Netapp Steelstore Cloud Integrated Storage, Oracle Global Lifecycle Management Opatch. ## How do I fix CVE-2020-8840? Upgrade com.fasterxml.jackson.core:jackson-databind to a fixed version for your release line: 2.6.7.4, 2.7.9.7, 2.8.11.5 or 2.9.10.3. ## Is CVE-2020-8840 being exploited? There is no known exploitation of CVE-2020-8840 in the wild and no public exploit code. Public exploit code: - FasterXML/jackson-databind 远程代码执行漏洞 (github_poc): https://github.com/jas502n/jackson-CVE-2020-8840 - CVE-2020-8840：FasterXML/jackson-databind 远程代码执行漏洞 (github_poc): https://github.com/fairyming/CVE-2020-8840 - 来源于jackson-CVE-2020-8840，需要开autotype (github_poc): https://github.com/Wfzsec/FastJson1.2.62-RCE - Jackson-databind远程代码执行漏洞（CVE-2020-8840）分析复现环境代码 (github_poc): https://github.com/Veraxy00/CVE-2020-8840 - jackson jndi injection (github_poc): https://github.com/Blyth0He/CVE-2020-8840 - https://github.com/dpredrag/CVE-2020-8840 (github_poc): https://github.com/dpredrag/CVE-2020-8840 ## 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-2020-8840 and fix it if it is affected. What it is: CVE-2020-8840 is a critical unsafe deserialization vulnerability in Debian Debian Linux, published on 10 Feb 2020. 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-2020-8840 in the wild and no public exploit code. Affected packages and fixed versions: - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.0.0; fixed in 2.6.7.4 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.0.0; fixed in 2.6.7.4 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.7.0; fixed in 2.7.9.7 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.7.0; fixed in 2.7.9.7 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.8.0; fixed in 2.8.11.5 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.8.0; fixed in 2.8.11.5 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.9.0; fixed in 2.9.10.3 - com.fasterxml.jackson.core:jackson-databind (Maven): affected from 2.9.0; fixed in 2.9.10.3 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-2020-8840/ (Markdown: https://insights.sbomify.com/CVE-2020-8840/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8840 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8840 - OSV: https://osv.dev/vulnerability/CVE-2020-8840 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-8840/ Summaries are generated and may contain mistakes; the official description above is the record.