FKIE_CVE-2026-68495
Vulnerability from fkie_nvd - Published: 2026-10-01 18:17 - Updated: 2026-10-01 19:17
Severity
Summary
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 parser defect in the same vendor advisory, GHSA-3v8f-v6vx-fmrm, which covers both binary formats. The CBOR parser defect (jackson-dataformats-binary issue #725) is CVE-2026-68495; the Smile parser defect (issue #726) is assigned CVE-2026-68496.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo1.maven.org/maven2",
"defaultStatus": "unaffected",
"packageName": "com.fasterxml.jackson.dataformat:jackson-dataformat-cbor",
"product": "jackson-dataformats-binary",
"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",
"versions": [
{
"lessThanOrEqual": "2.18.9",
"status": "affected",
"version": "2.16.0",
"versionType": "maven"
},
{
"lessThanOrEqual": "2.21.5",
"status": "affected",
"version": "2.19.0",
"versionType": "maven"
},
{
"lessThanOrEqual": "2.22.1",
"status": "affected",
"version": "2.22.0",
"versionType": "maven"
}
]
},
{
"collectionURL": "https://repo1.maven.org/maven2",
"defaultStatus": "unaffected",
"packageName": "tools.jackson.dataformat:jackson-dataformat-cbor",
"product": "jackson-dataformats-binary",
"programRoutines": [
{
"name": "tools.jackson.dataformat.cbor.CBORParser._decodeLongerName"
},
{
"name": "tools.jackson.dataformat.cbor.CBORParser._decodeChunkedName"
}
],
"repo": "https://github.com/FasterXML/jackson-dataformats-binary",
"vendor": "FasterXML",
"versions": [
{
"lessThanOrEqual": "3.1.5",
"status": "affected",
"version": "3.0.0",
"versionType": "maven"
},
{
"lessThanOrEqual": "3.2.1",
"status": "affected",
"version": "3.2.0",
"versionType": "maven"
}
]
}
],
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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\u0027s 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\u0027s 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 parser defect in the same vendor advisory, GHSA-3v8f-v6vx-fmrm, which covers both binary formats. The CBOR parser defect (jackson-dataformats-binary issue #725) is CVE-2026-68495; the Smile parser defect (issue #726) is assigned CVE-2026-68496."
}
],
"id": "CVE-2026-68495",
"lastModified": "2026-10-01T19:17:24.277",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-68495",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-01T18:16:18.497961Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-10-01T18:17:27.167",
"references": [
{
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"url": "https://github.com/FasterXML/jackson-dataformats-binary/blob/2.18/release-notes/VERSION-2.x"
},
{
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"url": "https://github.com/FasterXML/jackson-dataformats-binary/issues/725"
},
{
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"url": "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-3v8f-v6vx-fmrm"
},
{
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-68496"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-3v8f-v6vx-fmrm"
}
],
"sourceIdentifier": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-400"
},
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"type": "Secondary"
}
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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