{"id":"CVE-2026-110879","revision":null,"records":[{"revision":"f708889fcf0047628253adb96b2b831a","observedAt":"2026-10-28T02:00:16.672+00:00","statement":{"source":"cve-program","id":"CVE-2026-110879","aliases":[],"title":"jackson-databind: PolymorphicTypeValidator bypass via generic type arguments and array element types allows arbitrary class instantiation (incomplete fix for CVE-2026-54512)","description":"jackson-databind validates the outer class of a class-name type ID but accepts attacker-selected classes inside its generic arguments, even when those classes violate the declared type or would be rejected as direct type IDs. This bypasses the generic-argument validation added for CVE-2026-54512 (GHSA-j3rv-43j4-c7qm), of which this is an incomplete fix.\n\n\n\nDatabindContext._resolveAndValidateGeneric() checks the outer class against the declared base type and then passes each argument from the type ID to _validateTypeParameter(), which validates the argument against the outer base type rather than enforcing its corresponding declared generic binding. It also invokes validators with arguments that have not passed the subtype check those validators expect. Under the default DefaultBaseTypeLimitingValidator this accepts an unrelated class inside a generic subtype even when the same class is rejected as a direct type ID. Where an allowIfBaseType(...) rule approves the outer type, Jackson substitutes LaissezFaireSubTypeValidator, so the configured validator no longer restricts the embedded arguments. The element type of a plain array type ID such as [Lpkg.Gadget; is likewise left unvalidated once the array's base type is approved.\n\n\n\nAffected paths include annotation-based class-name polymorphism with a default Jackson 3.x JsonMapper, configured default typing in both Jackson 2.x and 3.x, and integrations that expose that default typing. The default-validator case requires no application-authored validator: with @JsonTypeInfo(use = Id.CLASS), a direct gadget type ID is rejected as \"Not a subtype\", while a type ID naming a generic wrapper around the same gadget is accepted and deserialized, including attacker-supplied bean properties. Where class-name default typing permits Map, a property declared as Map<String,String> accepts HashMap<FileSystemXmlApplicationContext,String>; map-key discovery then passes the attacker-controlled JSON property name to the selected class's one-string constructor. With Spring on the classpath and attacker-controlled XML the application can load, that constructor loads the XML and invokes ProcessBuilder.start() under the application account, giving arbitrary command execution.\n\n\n\nThis issue affects com.fasterxml.jackson.core:jackson-databind from 2.10.0 and tools.jackson.core:jackson-databind from 3.0.0. Releases before 2.10.0 are not affected, because PolymorphicTypeValidator was introduced in jackson-databind 2.10.0.","state":0,"publishedAt":"2026-10-28T00:07:41.577+00:00","modifiedAt":"2026-10-28T00:07:41.577+00:00","affected":[{"ecosystem":"https://repo.maven.apache.org/maven2","name":"com.fasterxml.jackson.core:jackson-databind","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"FasterXML\",\n                    \"product\": \"jackson-databind\",\n                    \"collectionURL\": \"https://repo.maven.apache.org/maven2\",\n                    \"packageName\": \"com.fasterxml.jackson.core:jackson-databind\",\n                    \"repo\": \"https://github.com/FasterXML/jackson-databind\",\n                    \"programFiles\": [\n                        \"src/main/java/com/fasterxml/jackson/databind/DatabindContext.java\",\n                        \"src/main/java/com/fasterxml/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java\",\n                        \"src/main/java/com/fasterxml/jackson/databind/jsontype/impl/StdTypeResolverBuilder.java\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"DatabindContext._resolveAndValidateGeneric\"\n                        },\n                        {\n                            \"name\": \"DatabindContext._validateTypeParameter\"\n                        },\n                        {\n                            \"name\": \"DefaultBaseTypeLimitingValidator\"\n                        },\n                        {\n                            \"name\": \"StdTypeResolverBuilder\"\n                        }\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.10.0\",\n                            \"lessThan\": \"2.18.12\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"2.18.12\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.19.0\",\n                            \"lessThan\": \"2.21.8\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"2.21.8\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.22.0\",\n                            \"lessThan\": \"2.22.4\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"2.22.4\",\n                            \"versionType\": \"maven\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"},{"ecosystem":"https://repo.maven.apache.org/maven2","name":"tools.jackson.core:jackson-databind","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"FasterXML\",\n                    \"product\": \"jackson-databind\",\n                    \"collectionURL\": \"https://repo.maven.apache.org/maven2\",\n                    \"packageName\": \"tools.jackson.core:jackson-databind\",\n                    \"repo\": \"https://github.com/FasterXML/jackson-databind\",\n                    \"programFiles\": [\n                        \"src/main/java/tools/jackson/databind/DatabindContext.java\",\n                        \"src/main/java/tools/jackson/databind/jsontype/DefaultBaseTypeLimitingValidator.java\",\n                        \"src/main/java/tools/jackson/databind/jsontype/impl/StdTypeResolverBuilder.java\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"DatabindContext._resolveAndValidateGeneric\"\n                        },\n                        {\n                            \"name\": \"DatabindContext._validateTypeParameter\"\n                        },\n                        {\n                            \"name\": \"DefaultBaseTypeLimitingValidator\"\n                        },\n                        {\n                            \"name\": \"StdTypeResolverBuilder\"\n                        }\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.0.0\",\n                            \"lessThan\": \"3.1.8\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"3.1.8\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"3.2.0\",\n                            \"lessThan\": \"3.2.4\",\n                            \"versionType\": \"maven\"\n                        },\n                        {\n                            \"status\": \"unaffected\",\n                            \"version\": \"3.2.4\",\n                            \"versionType\": \"maven\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-m8xf-2cr7-77ph","https://github.com/FasterXML/jackson-databind/security/advisories/GHSA-j3rv-43j4-c7qm","https://www.cve.org/CVERecord?id=CVE-2026-54512"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-110879","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-110879","identifiers":["CVE-2026-110879"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-31T17:06:49.5453808+00:00","complete":true,"records":1766,"lastAttemptAt":"2026-10-31T17:06:49.5453808+00:00","lastSuccessAt":"2026-10-31T17:06:49.7005889+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:06:49.7005902+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-9266d7b009bf9c4a0ccdcb5cbdea7f905cb3c4d92fd3b41581ece16b2cfdc4e7-784b766ea38315a717f0f300983019726d402e8f914672a2c27c9b5c7ac467c0","complete":true,"records":417579,"lastAttemptAt":"2026-10-31T17:04:51.2200836+00:00","lastSuccessAt":"2026-10-31T17:04:51.1803831+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:04:51.2200836+00:00","snapshotPublishedAt":"2026-10-31T16:26:28+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-1ea90a365f5b43ef9a5b92be53fe0867","complete":true,"records":13565,"lastAttemptAt":"2026-10-31T17:07:15.7147939+00:00","lastSuccessAt":"2026-10-31T11:34:32.033+00:00","error":null,"lastVerifiedAt":"2026-10-31T11:34:32.033+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13637,"expectedIdentifiers":13637,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-31T17:06:49.5453808+00:00","complete":true,"records":1094,"lastAttemptAt":"2026-10-31T17:06:49.5453808+00:00","lastSuccessAt":"2026-10-31T17:06:49.7014183+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:06:49.7014185+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-76f55bade79746ceb7d00f18b2c86efc","complete":true,"records":13578,"lastAttemptAt":"2026-10-31T17:07:15.0280111+00:00","lastSuccessAt":"2026-10-31T17:07:15.025+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:07:15.025+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13637,"expectedIdentifiers":13637,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-21dcd6662970dfea02e4ea60ee637115e8d92664947484d2b9276b3f6568a84f","complete":true,"records":9815,"lastAttemptAt":"2026-10-31T17:06:49.3868114+00:00","lastSuccessAt":"2026-10-30T23:47:34.1817587+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:06:49.3868114+00:00","snapshotPublishedAt":"2026-10-30T23:33:17+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-2de9ccc5290f060c7aa63f89c25dd76f655a64ba1aba7c05c97fa3bee4f09899","complete":true,"records":1967,"lastAttemptAt":"2026-10-31T17:04:51.3839718+00:00","lastSuccessAt":"2026-10-28T20:55:34.2982937+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:04:51.3839718+00:00","snapshotPublishedAt":"2026-10-28T20:03:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-f95f76cd406ae5bae3de632ad37fd2d5160b44f5e6b51748ac6f8f0c0c88e72b","complete":true,"records":3028,"lastAttemptAt":"2026-10-31T17:06:49.5070707+00:00","lastSuccessAt":"2026-10-30T23:47:38.4914494+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:06:49.5070707+00:00","snapshotPublishedAt":"2026-10-30T23:18:12+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-712291bb5a0ee4f1ca7325e317f98ff05e9ab8d14f863abf00a323d9e6d8331e","complete":true,"records":230994,"lastAttemptAt":"2026-10-31T17:06:49.2526999+00:00","lastSuccessAt":"2026-10-31T17:06:47.8999408+00:00","error":null,"lastVerifiedAt":"2026-10-31T17:06:49.2526999+00:00","snapshotPublishedAt":"2026-10-31T16:33:38+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}