---
title: "CVE-2026-89425: FasterXML jackson-core - Denial of Service"
description: "FasterXML jackson-core >= 2.8.0 contains an out-of-bounds error caused by unbounded token accumulation in UTF8DataInputJsonParser._reportInvalidToken(), letting attackers cause JVM OutOfMemoryError, exploit requires malformed token input via DataInput parser."
url: https://panop.io/threat-heartbeat/CVE-2026-89425/
---

# CVE-2026-89425 FasterXML jackson-core - Denial of Service

FasterXML jackson-core >= 2.8.0 contains an out-of-bounds error caused by unbounded token accumulation in UTF8DataInputJsonParser.\_reportInvalidToken(), letting attackers cause JVM OutOfMemoryError, exploit requires malformed token input via DataInput parser.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.49% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89425)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

23 September 2026

Updated

15 October 2026

Weakness

[CWE-400](https://cwe.mitre.org/data/definitions/400.html)

## Vendor fix

Update to a version later than 2.8.0 with the fix applied or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89425](https://nvd.nist.gov/vuln/detail/CVE-2026-89425)
- [https://github.com/FasterXML/jackson-core/pull/1698](https://github.com/FasterXML/jackson-core/pull/1698)
- [https://github.com/FasterXML/jackson-core/security/advisories/GHSA-7hhh-6rmp-j9qf](https://github.com/FasterXML/jackson-core/security/advisories/GHSA-7hhh-6rmp-j9qf)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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