# Jackson Core: Document length constraint bypass in blocking, async, and DataInput parsers

Source: https://junglewise.ai/threats/jackson-core-document-length-constraint-bypass-in-blocking-async-and-cbf424ca  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-04  
License: CC BY 4.0 with a link back

Severity: low · CVSS 3.1 · Published 2026-04-04

Jackson Core: Document length constraint bypass in blocking, async, and DataInput parsers

Technologies: [tools.jackson.core:jackson-core (Maven)](https://junglewise.ai/threats/technologies/tools-jackson-core-jackson-core). Vendors: [Maven](https://junglewise.ai/threats/vendors/maven).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Low severity, with a CVSS score of 3.1, published 4 April 2026.

**Which products and versions are affected?** tools.jackson.core:jackson-core (Maven) ECOSYSTEM:introduced=3.0.0,fixed=3.1.1.

**Is there a fix for This vulnerability?** Yes. tools.jackson.core:jackson-core (Maven): upgrade to 3.1.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run tools.jackson.core:jackson-core (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- tools.jackson.core:jackson-core (Maven): upgrade to 3.1.1 or later

  ```sh
  # set tools.jackson.core:jackson-core to 3.1.1 in your pom.xml or build.gradle
  ```


## Affected products

- tools.jackson.core:jackson-core (Maven) ECOSYSTEM:introduced=3.0.0,fixed=3.1.1

## Related threats

- [FasterXML jackson-core denial of service in UTF8DataInputJsonParser](https://junglewise.ai/threats/cve-2026-89425-utf8datainputjsonparser-reportinvalidtoken-in-fasterxml-jackson)
- [FasterXML jackson-core regular expression denial of service in NumberInput](https://junglewise.ai/threats/cve-2026-89407-numberinput-lookslikevalidnumber-in-fasterxml-jackson-core-pre)
- [Duplicate Advisory: jackson-core: Async parser maxNumberLength bypass via chunked digit accumulation (incomplete fix for GHSA-72hv-8253-57qq)](https://junglewise.ai/threats/duplicate-advisory-jackson-core-async-parser-maxnumberlength-bypass-via-a661244e)
- [jackson-core: Number Length Constraint Bypass in Async Parser Leads to Potential DoS Condition](https://junglewise.ai/threats/cve-2026-18401-jackson-core-number-length-constraint-bypass-in-async-parser)
- [FasterXML jackson-core DoS via nesting depth limit bypass](https://junglewise.ai/threats/cve-2026-29062-fasterxml-jackson-core-dos-via-nesting-depth-limit-bypass)