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vuln-cve/data/2026/106xxx/CVE-2026-106554.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-106554",
"assignerOrgId": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"state": "PUBLISHED",
"assignerShortName": "HeroDevs",
"dateReserved": "2026-10-06T20:27:12.839Z",
"datePublished": "2026-11-04T16:14:05.664Z",
"dateUpdated": "2026-11-10T12:57:37.610Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "36c7be3b-2937-45df-85ea-ca7133ea542c",
"shortName": "HeroDevs",
"dateUpdated": "2026-11-04T16:14:05.664Z"
},
"title": "jackson-dataformat-cbor: quadratic-time TagList growth on unbounded stacked tags (CPU/GC DoS, PoC)",
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"cweId": "CWE-407",
"description": "CWE-407 Inefficient Algorithmic Complexity",
"type": "CWE"
}
]
}
],
"affected": [
{
"vendor": "FasterXML",
"product": "jackson-dataformat-cbor",
"collectionURL": "https://repo.maven.apache.org/maven2",
"packageName": "com.fasterxml.jackson.dataformat:jackson-dataformat-cbor",
"repo": "https://github.com/FasterXML/jackson-dataformats-binary",
"programFiles": [
"cbor/src/main/java/.../cbor/CBORParser.java"
],
"programRoutines": [
{
"name": "CBORParser (tag handling -> TagList)"
}
],
"versions": [
{
"status": "affected",
"version": "2.15.0",
"lessThan": "2.18.12",
"versionType": "maven"
},
{
"status": "unaffected",
"version": "2.18.12",
"versionType": "maven"
},
{
"status": "affected",
"version": "2.19.0",
"lessThan": "2.21.8",
"versionType": "maven"
},
{
"status": "unaffected",
"version": "2.21.8",
"versionType": "maven"
},
{
"status": "affected",
"version": "2.22.0",
"lessThan": "2.22.4",
"versionType": "maven"
},
{
"status": "unaffected",
"version": "2.22.4",
"versionType": "maven"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "FasterXML",
"product": "jackson-dataformat-cbor",
"collectionURL": "https://repo.maven.apache.org/maven2",
"packageName": "tools.jackson.dataformat:jackson-dataformat-cbor",
"repo": "https://github.com/FasterXML/jackson-dataformats-binary",
"programFiles": [
"cbor/src/main/java/.../cbor/CBORParser.java"
],
"programRoutines": [
{
"name": "CBORParser (tag handling -> TagList)"
}
],
"versions": [
{
"status": "affected",
"version": "3.0.0",
"lessThan": "3.1.8",
"versionType": "maven"
},
{
"status": "unaffected",
"version": "3.1.8",
"versionType": "maven"
},
{
"status": "affected",
"version": "3.2.0",
"lessThan": "3.2.4",
"versionType": "maven"
},
{
"status": "unaffected",
"version": "3.2.4",
"versionType": "maven"
}
],
"defaultStatus": "unaffected"
}
],
"descriptions": [
{
"lang": "en",
"value": "One CBOR-parsing issue in jackson-dataformats-binary's CBOR module: an unbounded run of CBOR tags drives quadratic-time TagList growth (CPU/GC-exhaustion DoS, PoC-proven).\n\n\n\nPoC executed against com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:2.18.2; present in current 2.x and 3.x (tools.jackson.dataformat.cbor) HEAD. Distinct from the Avro and Smile/Protobuf advisories for this repo.\n\n\n\nQuadratic CPU/GC DoS from an unbounded chain of CBOR tags (PoC-proven). File: cbor/src/main/java/.../cbor/CBORParser.java (tag handling -> TagList).\n\n\n\nCBOR permits a data item to be preceded by any number of semantic tags. The CBOR parser accumulates them in a TagList whose backing array grows by a fixed increment (+8), not by doubling, and re-scans/copies on each growth. An attacker sends a value preceded by a long run of tag bytes; the fixed-increment growth makes accumulating N tags O(N^2) in time (plus GC pressure), with no cap on the number of stacked tags.\n\n\n\nPoC (executed, JDK 17): feeding a CBOR stream consisting of a long run of tag bytes (e.g. tag 0xC0+) before a trivial value forces quadratic CPU/GC; parse time grows super-linearly with the tag count, pinning a request thread with no configurable limit.\n\n\n\nImpact. Algorithmic-complexity denial of service (CWE-407): a modest input of stacked tags consumes quadratic CPU/GC, pinning a request thread; concurrent requests exhaust the pool.\n\n\n\nFix. Grow TagList by doubling and/or cap the number of stacked tags (StreamReadConstraints-style).",
"supportingMedia": [
{
"type": "text/html",
"base64": false,
"value": "<p>One CBOR-parsing issue in jackson-dataformats-binary's CBOR module: an unbounded run of CBOR tags drives quadratic-time TagList growth (CPU/GC-exhaustion DoS, PoC-proven).</p><p>PoC executed against com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:2.18.2; present in current 2.x and 3.x (tools.jackson.dataformat.cbor) HEAD. Distinct from the Avro and Smile/Protobuf advisories for this repo.</p><p>Quadratic CPU/GC DoS from an unbounded chain of CBOR tags (PoC-proven). File: cbor/src/main/java/.../cbor/CBORParser.java (tag handling -&gt; TagList).</p><p>CBOR permits a data item to be preceded by any number of semantic tags. The CBOR parser accumulates them in a TagList whose backing array grows by a fixed increment (+8), not by doubling, and re-scans/copies on each growth. An attacker sends a value preceded by a long run of tag bytes; the fixed-increment growth makes accumulating N tags O(N^2) in time (plus GC pressure), with no cap on the number of stacked tags.</p><p>PoC (executed, JDK 17): feeding a CBOR stream consisting of a long run of tag bytes (e.g. tag 0xC0+) before a trivial value forces quadratic CPU/GC; parse time grows super-linearly with the tag count, pinning a request thread with no configurable limit.</p><p>Impact. Algorithmic-complexity denial of service (CWE-407): a modest input of stacked tags consumes quadratic CPU/GC, pinning a request thread; concurrent requests exhaust the pool.</p><p>Fix. Grow TagList by doubling and/or cap the number of stacked tags (StreamReadConstraints-style).</p>"
}
]
}
],
"tags": [
"x_open-source"
],
"references": [
{
"url": "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-cjg7-h3pr-p927",
"name": "GHSA-cjg7-h3pr-p927",
"tags": [
"vendor-advisory"
]
}
],
"metrics": [
{
"other": {
"type": "severity",
"content": {
"text": "MEDIUM"
}
},
"format": "other",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"timeline": [
{
"time": "2026-10-22T21:30:00.000Z",
"lang": "en",
"value": "GHSA-cjg7-h3pr-p927 published in FasterXML/jackson-dataformats-binary"
}
],
"credits": [
{
"lang": "en",
"value": "apvxlab (AppViewX security research)",
"type": "reporter"
},
{
"lang": "en",
"value": "v0xyc0n (www.jpac.at)",
"type": "reporter"
}
],
"source": {
"advisory": "GHSA-cjg7-h3pr-p927",
"discovery": "EXTERNAL"
},
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
},
"adp": [
{
"references": [
{
"url": "https://github.com/FasterXML/jackson-dataformats-binary/security/advisories/GHSA-cjg7-h3pr-p927",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"cvssV3_1": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-11-10T12:57:21.443264Z",
"id": "CVE-2026-106554",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-11-10T12:57:37.610Z"
}
}
]
}
}
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