CVE-2026-19032

jackson-databind resolves attacker-controlled URI schemes when deserializing java.nio.file.Path

Published Sep 1, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Upgrade to jackson-databind 2.18.10, 2.21.6, 2.22.2 (com.fasterxml.jackson.core) or 3.1.6, 3.2.2 (tools.jackson.core). The fix introduces a URI scheme allow-list that defaults to "file" only. Values with no scheme are still read as local filesystem paths. Any other scheme, including jar:, is rejected via handleWeirdStringValue before the ServiceLoader<FileSystemProvider> lookup is reached, so untrusted JSON can no longer select a provider. Applications that legitimately need other schemes can construct NioPathDeserializer with an explicit collection of allowed schemes. Note that this is a behavioral change: code that previously relied on non-file schemes being resolved will need to opt in.


Vendor Workaround

Do not bind java.nio.file.Path-typed fields from untrusted JSON. Where a filesystem path must be accepted, deserialize it as a String and validate it in application code before converting to a Path.

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-wjgm-6hv5-3cvf jackson-databind: Path Deserialization Missing Scheme Allowlist for FileSystemProvider Resolution
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Fasterxml
Fasterxml jackson-databind
Vendors & Products Fasterxml
Fasterxml jackson-databind
Type Values Removed Values Added
Description 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.
Title jackson-databind resolves attacker-controlled URI schemes when deserializing java.nio.file.Path
Weaknesses CWE-470
CWE-610
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
HeroDevs
Published
Updated
Sep 1, 2026, 1:13 PM
Reserved
Aug 6, 2026, 3:59 AM
Status
Awaiting Analysis
Published
Sep 1, 2026, 4:18 AM
Modified
Sep 8, 2026, 7:29 PM
Severity
Moderate
Public date
Sep 1, 2026, 3:18 AM