CVE-2026-18401

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,...

CVE-2026-18401 jackson-core: Number length constraint bypass in non-blocking (async) JSON parser leads to potential denial of service

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,...

CVE-2026-18401

The CVE describes a vulnerability in jackson-core’s non-blocking (async) JSON parser where maxNumberLength is not enforced, unlike the synchronous parser. Root cause: the async parsing path in NonBlockingUtf8JsonParserBase does not invoke number length validation; _finishNumberIntegralPart() accu...

Security Bulletin: IBM SPSS Modeler is affected by a jackson-core async parser DoS vulnerability (WS-2026-0003)

Summary IBM SPSS Modeler is affected by a jackson-core async parser DoS vulnerability WS-2026-0003. This has been addressed in the remediation section. Vulnerability Details ID:WS-2026-0003 DESCRIPTION: The non-blocking async JSON parser in jackson-core bypasses the maxNumberLength constraint...