FasterXML jackson-databind up to 3.2.1 Deserializer input validation

Summaryinfo

A vulnerability, which was classified as problematic, was found in FasterXML jackson-databind up to 2.18.9/2.21.5/2.22.1/3.1.5/3.2.1. Affected by this vulnerability is the function JDKFromStringDeserializer.NioPathHelper.deserialize of the component Deserializer. The manipulation results in input validation. This vulnerability was named CVE-2026-19032. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in FasterXML jackson-databind up to 2.18.9/2.21.5/2.22.1/3.1.5/3.2.1. It has been classified as problematic. Affected is the function JDKFromStringDeserializer.NioPathHelper.deserialize of the component Deserializer. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

jackson-databind's deserializer for java.nio.file.Path resolves an attacker-supplied URI without restricting the URI scheme. In JDKFromStringDeserializer.NioPathHelper.deserialize, a string bound from untrusted JSON is passed to new URI(value) and then to Path.of(uri). When that throws FileSystemNotFoundException, the code enumerates ServiceLoader<FileSystemProvider> and calls provider.getPath(uri) on the first provider whose scheme matches the attacker-chosen scheme. Untrusted JSON can therefore select and drive an arbitrary registered FileSystemProvider during readValue under a default JsonMapper, and forces provider class loading at the same time. With only the JDK built-in providers (file, jar/zipfs) present, the resolved path is inert and no mount or network I/O occurs; further impact requires a side-effecting third-party FileSystemProvider on the classpath. This affects com.fasterxml.jackson.core:jackson-databind from 2.8.0 before 2.18.10, from 2.19.0 before 2.21.6, and from 2.22.0 before 2.22.2, and tools.jackson.core:jackson-databind from 3.0.0 before 3.1.6 and from 3.2.0 before 3.2.2. Users should upgrade to 2.18.10, 2.21.6, 2.22.2, 3.1.6, or 3.2.2. Binding java.nio.file.Path from untrusted JSON should be avoided regardless of version.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-19032 since 08/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 2.18.10, 2.21.6, 2.22.2, 3.1.6 or 3.2.2 eliminates this vulnerability.

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Productinfo

Type

• Programming Language Software

Vendor

• FasterXML

Name

• jackson-databind

Version

• 2.18.0
• 2.18.1
• 2.18.2
• 2.18.3
• 2.18.4
• 2.18.5
• 2.18.6
• 2.18.7
• 2.18.8
• 2.18.9
• 2.21.0
• 2.21.1
• 2.21.2
• 2.21.3
• 2.21.4
• 2.21.5
• 2.22.0
• 2.22.1
• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.2.0
• 3.2.1

License

• open-source

Website

• Product: https://github.com/FasterXML/jackson-databind/

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