jackson-dataformats-binary: CBOR parser does not enforce StreamReadConstraints.maxNameLength, enabling memory-exhaustion denial of service
The CBOR parser in FasterXML jackson-dataformats-binary never invokes StreamReadConstraints.validateNameLength() when decoding JSON object property names, so the maxNameLength limit is not enforced for this format. CBORParser._decodeLongerName() decodes a definite-length property name with no length check, and CBORParser._decodeChunkedName() delegates to the value-oriented _finishChunkedText() routine, which validates maxStringLength rather than maxNameLength. An attacker who can have a CBOR document parsed may therefore embed a single property name of unbounded length; the parser buffers the whole name in memory before returning it, whatever maxNameLength is configured to. Because StreamReadConstraints.maxDocumentLength is also disabled by default, nothing else bounds the name under default settings, so the only limits are the attacker's upload capacity and available heap, leading to memory exhaustion and denial of service. No privileges beyond the ability to submit data to a parsing endpoint are required, and exploitation needs only that the bytes reach CBORFactory parsing, directly or through an ObjectMapper configured with the CBOR module. jackson-core's own JSON parsers enforce maxNameLength incrementally during name decoding; this gap is specific to the binary formats. maxNameLength and validateNameLength were introduced in jackson-core 2.16.0, so releases before 2.16.0 do not contain the constraint that is left unenforced. This issue is tracked together with the Smile
CVE-2026-68495
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-68495
jackson-dataformats-binary
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
jackson-dataformats-binary
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/FasterXML/jackson-dataformats-binary",
"vendor": "FasterXML",
"product": "jackson-dataformats-binary",
"versions": [
{
"status": "affected",
"version": "2.16.0",
"versionType": "maven",
"lessThanOrEqual": "2.18.9"
},
{
"status": "affected",
"version": "2.19.0",
"versionType": "maven",
"lessThanOrEqual": "2.21.5"
},
{
"status": "affected",
"version": "2.22.0",
"versionType": "maven",
"lessThanOrEqual": "2.22.1"
}
],
"packageName": "com.fasterxml.jackson.dataformat:jackson-dataformat-cbor",
"collectionURL": "https://repo1.maven.org/maven2",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "com.fasterxml.jackson.dataformat.cbor.CBORParser._decodeLongerName"
},
{
"name": "com.fasterxml.jackson.dataformat.cbor.CBORParser._decodeChunkedName"
}
]
},
{
"repo": "https://github.com/FasterXML/jackson-dataformats-binary",
"vendor": "FasterXML",
"product": "jackson-dataformats-binary",
"versions": [
{
"status": "affected",
"version": "3.0.0",
"versionType": "maven",
"lessThanOrEqual": "3.1.5"
},
{
"status": "affected",
"version": "3.2.0",
"versionType": "maven",
"lessThanOrEqual": "3.2.1"
}
],
"packageName": "tools.jackson.dataformat:jackson-dataformat-cbor",
"collectionURL": "https://repo1.maven.org/maven2",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "tools.jackson.dataformat.cbor.CBORParser._decodeLongerName"
},
{
"name": "tools.jackson.dataformat.cbor.CBORParser._decodeChunkedName"
}
]
}
]- Related CVEs
- CVE-2026-68495
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #7622 · Revision 1
- Added to Heist Feed
- Publisher date