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              "value": "\u003cp\u003eThe non-blocking (asynchronous) JSON parser in jackson-core does not enforce the maxNumberLength constraint defined in StreamReadConstraints (default: 1000 characters). An attacker able to submit JSON to an application that uses the async parser API can supply a number token of arbitrary length, leading to excessive memory allocation and potential CPU exhaustion, resulting in a denial of service.\u003c/p\u003e\u003cp\u003eThe synchronous parser enforces this limit correctly, so the constraint is applied inconsistently depending on which parsing API the application uses.\u003c/p\u003e\u003cp\u003e\u003cb\u003eRoot cause:\u003c/b\u003e the async parsing path in NonBlockingUtf8JsonParserBase and related classes never invokes the number length validation methods. Number parsing methods such as _finishNumberIntegralPart() accumulate digits into the TextBuffer without any length check, then call _valueComplete() to finalize the token. _valueComplete() does not call resetInt() or resetFloat(), which are the methods in ParserBase where validateIntegerLength() and validateFPLength() are performed. Because that validation step is skipped, maxNumberLength is never enforced on the async code path.\u003c/p\u003e\u003cp\u003e\u003cb\u003eImpact:\u003c/b\u003e an attacker sending a JSON document containing an arbitrarily long number to an application using the async parser (for example a Spring WebFlux or other reactive application) can cause unbounded allocation in the TextBuffer and an OutOfMemoryError. If the application subsequently calls getBigIntegerValue() or getDecimalValue(), the JVM may additionally be tied up in O(n^2) BigInteger parsing, causing CPU-based denial of service.\u003c/p\u003e\u003cp\u003eNo privileges or user interaction beyond the ability to submit data for parsing are required.\u003c/p\u003e\u003cp\u003eThis issue affects com.fasterxml.jackson.core:jackson-core from version 2.15.0 through 2.18.5 and from 2.19.0 through 2.21.0, and tools.jackson.core:jackson-core from 3.0.0 through 3.0.x.\u003c/p\u003e\u003cp\u003eVersions prior to 2.15.0 are not affected, because StreamReadConstraints -- which defines the maxNumberLength setting -- was first introduced in jackson-core 2.15.0, so no such constraint exists to be bypassed in earlier releases. Note that GHSA-72hv-8253-57qq records the lower bound of the affected 2.x range as 2.0.0.\u003c/p\u003e"
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          "value": "The non-blocking (asynchronous) JSON parser in jackson-core does not enforce the maxNumberLength constraint defined in StreamReadConstraints (default: 1000 characters). An attacker able to submit JSON to an application that uses the async parser API can supply a number token of arbitrary length, leading to excessive memory allocation and potential CPU exhaustion, resulting in a denial of service.\n\n\n\nThe synchronous parser enforces this limit correctly, so the constraint is applied inconsistently depending on which parsing API the application uses.\n\n\n\nRoot cause: the async parsing path in NonBlockingUtf8JsonParserBase and related classes never invokes the number length validation methods. Number parsing methods such as _finishNumberIntegralPart() accumulate digits into the TextBuffer without any length check, then call _valueComplete() to finalize the token. _valueComplete() does not call resetInt() or resetFloat(), which are the methods in ParserBase where validateIntegerLength() and validateFPLength() are performed. Because that validation step is skipped, maxNumberLength is never enforced on the async code path.\n\n\n\nImpact: an attacker sending a JSON document containing an arbitrarily long number to an application using the async parser (for example a Spring WebFlux or other reactive application) can cause unbounded allocation in the TextBuffer and an OutOfMemoryError. If the application subsequently calls getBigIntegerValue() or getDecimalValue(), the JVM may additionally be tied up in O(n^2) BigInteger parsing, causing CPU-based denial of service.\n\n\n\nNo privileges or user interaction beyond the ability to submit data for parsing are required.\n\n\n\nThis issue affects com.fasterxml.jackson.core:jackson-core from version 2.15.0 through 2.18.5 and from 2.19.0 through 2.21.0, and tools.jackson.core:jackson-core from 3.0.0 through 3.0.x.\n\n\n\nVersions prior to 2.15.0 are not affected, because StreamReadConstraints -- which defines the maxNumberLength setting -- was first introduced in jackson-core 2.15.0, so no such constraint exists to be bypassed in earlier releases. Note that GHSA-72hv-8253-57qq records the lower bound of the affected 2.x range as 2.0.0."
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              "value": "\u003cp\u003eThe fix released in jackson-core 2.18.6 and 2.21.1 for \u003cb\u003eCVE-2026-18401\u003c/b\u003e (GHSA-72hv-8253-57qq, number length constraint bypass in the non-blocking parser) is incomplete. This record covers the remaining bypass.\u003c/p\u003e\u003cp\u003eThe earlier fix wired \u003ctt\u003evalidateIntegerLength()\u003c/tt\u003e into a new \u003ctt\u003e_setIntLength()\u003c/tt\u003e helper and invoked it wherever the integer portion of a number is \u003ci\u003edecided\u003c/i\u003e: a terminator byte arrives, a \u003ctt\u003e.\u003c/tt\u003e or \u003ctt\u003ee\u003c/tt\u003e/\u003ctt\u003eE\u003c/tt\u003e is seen, or input ends inside a fully buffered value. It was not invoked on the attacker-relevant path where the parser runs out of input while still inside the \u003ctt\u003eMINOR_NUMBER_INTEGER_DIGITS\u003c/tt\u003e minor state and returns \u003ctt\u003eNOT_AVAILABLE\u003c/tt\u003e to the caller.\u003c/p\u003e\u003cp\u003eAs a result, an attacker who streams JSON to a non-blocking parser in many small chunks, without ever sending a terminator byte, keeps the parser inside \u003ctt\u003eMINOR_NUMBER_INTEGER_DIGITS\u003c/tt\u003e indefinitely. \u003ctt\u003e_textBuffer.expandCurrentSegment()\u003c/tt\u003e grows the accumulator on every chunk while \u003ctt\u003evalidateIntegerLength()\u003c/tt\u003e is never called. The accumulator is bounded only by \u003ctt\u003emaxStringLength\u003c/tt\u003e (20 MiB by default) rather than by \u003ctt\u003emaxNumberLength\u003c/tt\u003e (1000 by default), an amplification of roughly 20,000x over the documented limit. Because Java \u003ctt\u003echar\u003c/tt\u003e values occupy two bytes, a single connection can be driven to approximately 40 MiB of heap before the validator finally fires when the value completes.\u003c/p\u003e\u003cp\u003eThe equivalent fraction-path code is correct: \u003ctt\u003e_finishFloatFraction()\u003c/tt\u003e calls \u003ctt\u003e_setFractLength()\u003c/tt\u003e before its \u003ctt\u003eNOT_AVAILABLE\u003c/tt\u003e return. The missing call affects the integer-digit paths in \u003ctt\u003e_startPositiveNumber()\u003c/tt\u003e, \u003ctt\u003e_startNegativeNumber()\u003c/tt\u003e and \u003ctt\u003e_finishNumberIntegralPart()\u003c/tt\u003e in \u003ctt\u003eNonBlockingUtf8JsonParserBase\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003e\u003cb\u003eImpact:\u003c/b\u003e reactive frameworks such as Spring WebFlux/Reactor, Quarkus, Helidon and Vert.x feed inbound HTTP or gRPC bytes to the async parser as they arrive, which is precisely the chunked-feed shape required. Operators who set \u003ctt\u003eStreamReadConstraints.maxNumberLength\u003c/tt\u003e expecting it to cap memory per number value do not get that guarantee; memory accumulates per concurrent connection and attacker-controlled concurrency can exhaust the JVM heap. The synchronous parsers (\u003ctt\u003eUTF8StreamJsonParser\u003c/tt\u003e, \u003ctt\u003eReaderBasedJsonParser\u003c/tt\u003e) and the async parser operating on complete input are not affected.\u003c/p\u003e\u003cp\u003eExploitation requires only the ability to stream data to a parsing endpoint; no privileges or user interaction are needed.\u003c/p\u003e\u003cp\u003eThis issue affects \u003ctt\u003ecom.fasterxml.jackson.core:jackson-core\u003c/tt\u003e from version 2.15.0 through 2.18.7, and from 2.19.0 through 2.21.3, and \u003ctt\u003etools.jackson.core:jackson-core\u003c/tt\u003e from 3.0.0 through 3.1.3. Versions prior to 2.15.0 are not affected, because \u003ctt\u003eStreamReadConstraints\u003c/tt\u003e -- which defines the \u003ctt\u003emaxNumberLength\u003c/tt\u003e setting -- was first introduced in jackson-core 2.15.0, so no such constraint exists to be bypassed in earlier releases. Note that GHSA-r7wm-3cxj-wff9 states the affected 2.x range without a lower bound.\u003c/p\u003e\u003cp\u003eThe 2.22.x and 3.2.x release lines are not affected: those branches were created after the fix commit landed on 2026-05-21 and therefore contain it from their initial releases (2.22.0, tagged 2026-06-03, and 3.2.0, tagged 2026-06-08).\u003c/p\u003e"
            }
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          "value": "The fix released in jackson-core 2.18.6 and 2.21.1 for CVE-2026-18401 (GHSA-72hv-8253-57qq, number length constraint bypass in the non-blocking parser) is incomplete. This record covers the remaining bypass.\n\nThe earlier fix wired validateIntegerLength() into a new _setIntLength() helper and invoked it wherever the integer portion of a number is decided: a terminator byte arrives, a \u0027.\u0027 or \u0027e\u0027/\u0027E\u0027 is seen, or input ends inside a fully buffered value. It was not invoked on the attacker-relevant path where the parser runs out of input while still inside the MINOR_NUMBER_INTEGER_DIGITS minor state and returns NOT_AVAILABLE to the caller.\n\nAs a result, an attacker who streams JSON to a non-blocking parser in many small chunks, without ever sending a terminator byte, keeps the parser inside MINOR_NUMBER_INTEGER_DIGITS indefinitely. _textBuffer.expandCurrentSegment() grows the accumulator on every chunk while validateIntegerLength() is never called. The accumulator is bounded only by maxStringLength (20 MiB by default) rather than by maxNumberLength (1000 by default), an amplification of roughly 20,000x over the documented limit. Because Java char values occupy two bytes, a single connection can be driven to approximately 40 MiB of heap before the validator finally fires when the value completes.\n\nThe equivalent fraction-path code is correct: _finishFloatFraction() calls _setFractLength() before its NOT_AVAILABLE return. The missing call affects the integer-digit paths in _startPositiveNumber(), _startNegativeNumber() and _finishNumberIntegralPart() in NonBlockingUtf8JsonParserBase.\n\nImpact: reactive frameworks such as Spring WebFlux/Reactor, Quarkus, Helidon and Vert.x feed inbound HTTP or gRPC bytes to the async parser as they arrive, which is precisely the chunked-feed shape required. Operators who set StreamReadConstraints.maxNumberLength expecting it to cap memory per number value do not get that guarantee; memory accumulates per concurrent connection and attacker-controlled concurrency can exhaust the JVM heap. The synchronous parsers (UTF8StreamJsonParser, ReaderBasedJsonParser) and the async parser operating on complete input are not affected.\n\nExploitation requires only the ability to stream data to a parsing endpoint; no privileges or user interaction are needed.\n\nThis issue affects com.fasterxml.jackson.core:jackson-core from version 2.15.0 through 2.18.7, and from 2.19.0 through 2.21.3, and tools.jackson.core:jackson-core from 3.0.0 through 3.1.3. Versions prior to 2.15.0 are not affected, because StreamReadConstraints -- which defines the maxNumberLength setting -- was first introduced in jackson-core 2.15.0, so no such constraint exists to be bypassed in earlier releases. Note that GHSA-r7wm-3cxj-wff9 states the affected 2.x range without a lower bound. The 2.22.x and 3.2.x release lines are not affected: those branches were created after the fix commit landed on 2026-05-21 and therefore contain it from their initial releases (2.22.0, tagged 2026-06-03, and 3.2.0, tagged 2026-06-08)."
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              "lang": "en",
              "value": "Application streams attacker-supplied JSON to the non-blocking parser one network chunk at a time, for example via Jackson2JsonDecoder on the Flux\u003cDataBuffer\u003e streaming-decode path in Spring WebFlux, or any direct use of JsonFactory.createNonBlockingByteArrayParser() / createNonBlockingByteBufferParser()."
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          "descriptions": [
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              "cweId": "CWE-770",
              "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
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          ]
        }
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      "providerMetadata": {
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          "name": "FasterXML/jackson-core#1611 - Apply number-length validator on streaming integer path of async parser",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/FasterXML/jackson-core/pull/1611"
        },
        {
          "name": "FasterXML/jackson-core@050b429",
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          "lang": "en",
          "time": "2026-05-20T22:33:50.000Z",
          "value": "Fix merged upstream via FasterXML/jackson-core#1611 (milestone 2.18.8)"
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          "time": "2026-07-10T00:00:00.000Z",
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        },
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          "lang": "en",
          "time": "2026-07-21T00:00:00.000Z",
          "value": "Advisory reviewed and published to the GitHub Advisory Database"
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      "title": "jackson-core: Async parser maxNumberLength bypass via chunked digit accumulation (incomplete fix for CVE-2026-18401 / GHSA-72hv-8253-57qq)",
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    "assignerShortName": "HeroDevs",
    "cveId": "CVE-2026-68494",
    "datePublished": "2026-08-04T14:39:14.471Z",
    "dateReserved": "2026-07-30T15:20:37.472Z",
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