--- id: CVE-2026-89425 title: >- UTF8DataInputJsonParser._reportInvalidToken() in FasterXML jackson-core builds the offending-token text for its error message by appending Java identifier characters to a StringBuilder in a loop that has no upper bound summary: >- UTF8DataInputJsonParser._reportInvalidToken() in FasterXML jackson-core builds the offending-token text for its error message by appending Java identifier characters to a StringBuilder in a loop that has no upper bound. Unlike the three … severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-400 - CWE-770 - CWE-1050 vendor: FasterXML product: 'com.fasterxml.jackson.core:jackson-core' affected: - 'com.fasterxml.jackson.core:jackson-core >= 2.8.0 <= 2.18.10' - 'com.fasterxml.jackson.core:jackson-core >= 2.19.0 <= 2.21.6' - 'com.fasterxml.jackson.core:jackson-core >= 2.22.0 <= 2.22.2' - 'tools.jackson.core:jackson-core >= 3.0.0 <= 3.1.6' - 'tools.jackson.core:jackson-core >= 3.2.0 <= 3.2.2' published: '2026-09-23' updated: '2026-09-24' sourceUpdated: '2026-09-24T20:43:32.537' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89425' references: - url: 'https://github.com/FasterXML/jackson-core/pull/1698' label: 36c7be3b-2937-45df-85ea-ca7133ea542c - url: >- https://github.com/FasterXML/jackson-core/security/advisories/GHSA-7hhh-6rmp-j9qf label: 36c7be3b-2937-45df-85ea-ca7133ea542c - url: >- https://github.com/FasterXML/jackson-core/security/advisories/GHSA-7hhh-6rmp-j9qf label: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89425.json - url: 'https://access.redhat.com/security/cve/CVE-2026-89425' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2539084' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89425' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89425' - url: >- https://github.com/FasterXML/jackson-core/commit/211cf2c5d91abbec38067f37efc1363cd4e88ee3 - url: >- https://github.com/FasterXML/jackson-core/releases/tag/jackson-core-2.18.11 - url: 'https://github.com/FasterXML/jackson-core/releases/tag/jackson-core-3.2.3' - url: 'https://github.com/advisories/GHSA-7hhh-6rmp-j9qf' - url: 'https://access.redhat.com/errata/RHSA-2026:83082' - url: 'https://access.redhat.com/errata/RHSA-2026:83520' - url: 'https://access.redhat.com/errata/RHSA-2026:84734' - url: 'https://access.redhat.com/errata/RHSA-2026:86706' tags: - nvd - cve.org - exploit-available - csaf - vex - red-hat - ghsa - maven epss: 0.00532 epssPercentile: 0.44773 exploitAvailable: true ssvc: exploitation: poc automatable: 'yes' technicalImpact: partial timestamp: '2026-09-23T13:54:51.050132Z' ingestedAt: '2026-09-23T03:16:01.007Z' aliases: - GHSA-7hhh-6rmp-j9qf ecosystem: maven patched: - 'com.fasterxml.jackson.core:jackson-core 2.21.7' - 'com.fasterxml.jackson.core:jackson-core 2.22.3' - 'tools.jackson.core:jackson-core 3.1.7' - 'tools.jackson.core:jackson-core 3.2.3' - 'com.fasterxml.jackson.core:jackson-core 2.18.11' --- ## Overview UTF8DataInputJsonParser._reportInvalidToken() in FasterXML jackson-core builds the offending-token text for its error message by appending Java identifier characters to a StringBuilder in a loop that has no upper bound. Unlike the three sibling parser implementations, including UTF8StreamJsonParser, it never consults ErrorReportConfiguration.getMaxErrorTokenLength() (default 256). A malformed token supplied to a parser created through JsonFactory.createParser(DataInput) is therefore accumulated in full. No StreamReadConstraints setting mitigates this: maxDocumentLength cannot be applied to DataInput sources at all, and maxStringLength does not cover this path because the accumulation bypasses ReadConstrainedTextBuffer. The reporter measured a 20,000,109-character exception message from a 20-million-character malformed token on the DataInput path, against 367 characters for identical input on the InputStream path. Scaling the payload drives the StringBuilder, which also incurs byte-to-char expansion and internal array doubling, to many times the raw payload size and can trigger OutOfMemoryError for the whole JVM. UTF8DataInputJsonParser was introduced in 2.8.0 together with createParser(DataInput); releases before 2.8.0 do not contain the affected class. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **Red Hat VEX** · Important · affected: Exploit Intelligence, OpenShift Developer Tools and Services, OpenShift Serverless, Red Hat AI Inference Server, Red Hat AMQ Broker 7, Red Hat build of Apache Camel - HawtIO 4, … · no fix planned: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat JBoss Enterprise Application Platform 7, Red Hat OpenShift AI (RHOAI), … · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89425.json) - **RHSA-2026:83082** · Red Hat · fixed in: Red Hat build of Quarkus 3.27.6.redhat · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83082) - **RHSA-2026:83520** · Red Hat · fixed in: Red Hat build of Quarkus 3.33.4.redhat · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83520) - **RHSA-2026:84734** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84734) - **RHSA-2026:86706** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:86706) ## Package advisory (CVE-2026-89425) Affected packages: - `com.fasterxml.jackson.core:jackson-core >= 2.19.0, <= 2.21.6` - `com.fasterxml.jackson.core:jackson-core >= 2.22.0, <= 2.22.2` - `tools.jackson.core:jackson-core >= 3.0.0, <= 3.1.6` - `tools.jackson.core:jackson-core >= 3.2.0, <= 3.2.2` - `com.fasterxml.jackson.core:jackson-core >= 2.8.0, <= 2.18.10` Patched in: - `com.fasterxml.jackson.core:jackson-core 2.21.7` - `com.fasterxml.jackson.core:jackson-core 2.22.3` - `tools.jackson.core:jackson-core 3.1.7` - `tools.jackson.core:jackson-core 3.2.3` - `com.fasterxml.jackson.core:jackson-core 2.18.11` Source: https://github.com/advisories/GHSA-7hhh-6rmp-j9qf