jackson-core — security advisory
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.
- Products
- jackson-core
- Affected versions
- 2.10.0-1, 2.10.1-1, 2.12.1-1, 2.13.0-1, 2.13.0-2, 2.14.1-1, 2.14.1-1build1, 2.14.1-2, 2.4.2-2, 2.8.6-1, 2.9.1-1, 2.9.4-1, 2.9.8-3, 2.9.8-3~18.04
- Fixed versions
- Not specified
- CVEs
- CVE-2026-89425
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:31 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-89425
jackson-core
Fixed versions: Not specified
jackson-core
Fixed versions: Not specified
jackson-core
Fixed versions: Not specified
jackson-core
Fixed versions: Not specified
jackson-core
Fixed versions: Not specified
jackson-core
Fixed versions: Not specified
jackson-core
Fixed versions: Not specified
Complete source record
{
"id": "34194bca4d73340e1dac4f50e3b8198e9a79054879db1ee6ef61c80cdb1c091e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-89425",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-89425",
"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 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.",
"evidence": "osv:UBUNTU-CVE-2026-89425",
"products": [
{
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},
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{
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{
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{
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{
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"evidence": "/affected/3/versions"
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{
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"name": {
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{
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{
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{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-89425",
"aliases": [
"UBUNTU-CVE-2026-89425"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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"events": [
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],
"package": {
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"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
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],
"database_specific": {
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"ecosystem": "Ubuntu:18.04:LTS"
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],
"modified": "2026-10-17T13:01:16.611565717Z",
"provider": "osv",
"upstream": [
"CVE-2026-89425"
],
"references": [
"https://ubuntu.com/security/CVE-2026-89425",
"https://www.cve.org/CVERecord?id=CVE-2026-89425",
"https://github.com/FasterXML/jackson-core/security/advisories/GHSA-7hhh-6rmp-j9qf",
"https://github.com/FasterXML/jackson-core/pull/1698"
]
},
"related_cves": [
{
"value": "CVE-2026-89425",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361468,
"published_at": "2026-09-23T03:17:00+00:00"
}