jackson-core has Nesting Depth Constraint Bypass in `UTF8DataInputJsonParser` potentially allowing Resource Exhaustion
Summary
The UTF8DataInputJsonParser, which is used when parsing from a java.io.DataInput source, bypasses the maxNestingDepth constraint (default: 500) defined in StreamReadConstraints.
A similar issue was found in ReaderBasedJsonParser.
This allows a user to supply a JSON document with excessive nesting, which can cause a StackOverflowError when the structure is processed, leading to a Denial of Service (DoS).
The related fix for com.fasterxml.jackson.core:jackson-core, CVE-2025-52999, was not fully applied to tools.jackson.core:jackson-core until the 3.1.0 release. It is recommended that 3.0.x users upgrade.
Patches
jackson-core contains a configurable limit for how deep Jackson will traverse in an input document. This check was missing in a few places in tools.jackson.core:jackson-core.
The change is in https://github.com/FasterXML/jackson-core/pull/1554. jackson-core will throw a StreamConstraintsException if the limit is reached.
jackson-databind also benefits from this change because it uses jackson-core to parse JSON inputs.
Workarounds
Users should avoid parsing input files from untrusted sources.
Resources
GHSA-6v53-7c9g-w56r https://nvd.nist.gov/vuln/detail/CVE-2025-52999 https://github.com/FasterXML/jackson-core/pull/1554
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | tools.jackson.core:jackson-core | >= 3.0.0, < 3.1.0 | 3.1.0 |
References
- https://github.com/FasterXML/jackson-core/security/advisories/GHSA-6v53-7c9g-w56r
- https://github.com/FasterXML/jackson-core/security/advisories/GHSA-h46c-h94j-95f3
- https://nvd.nist.gov/vuln/detail/CVE-2025-52999
- https://nvd.nist.gov/vuln/detail/CVE-2026-29062
- https://github.com/FasterXML/jackson-core/pull/1554
- https://github.com/FasterXML/jackson-core/commit/8b25fd67f20583e75fb09564ce1eaab06cd5a902
- https://github.com/FasterXML/jackson-core
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-770- Platform
- Java / Kotlin (Maven)
- Package
tools.jackson.core:jackson-core- Disclosed
- 04.03.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6v53-7c9g-w56r - CC BY 4.0
Vulnerability history: tools.jackson.core:jackson-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 02.2026 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 1
Disclosures per year
- 2026: 6
-
jackson-core has Nesting Depth Constraint Bypass in `UTF8DataInputJsonParser` potentially allowing Resource Exhaustion this entry
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