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...

GHSA-R7WM-3CXJ-WFF9 jackson-core: Async parser maxNumberLength bypass via chunked digit accumulation (incomplete fix for GHSA-72hv-8253-57qq)

Summary The fix released in jackson-core 2.18.6 and 2.21.1 for GHSA-72hv-8253-57qq Number Length Constraint Bypass in Async Parser, published 2026-02-28 is incomplete. The fix commit b0c428e6 1555 wired validateIntegerLength into a new setIntLength helper and called it at every place where the...

jackson-core: Async parser maxNumberLength bypass via chunked digit accumulation (incomplete fix for GHSA-72hv-8253-57qq)

Summary The fix released in jackson-core 2.18.6 and 2.21.1 for GHSA-72hv-8253-57qq Number Length Constraint Bypass in Async Parser, published 2026-02-28 is incomplete. The fix commit b0c428e6 1555 wired validateIntegerLength into a new setIntLength helper and called it at every place where the...

Security Bulletin: Vulnarability in jackson-core library (WS-2026-0003) affects Power HMC.

Summary The jackson-core library is used by Power Hardware Management Console HMC. HMC has addressed the applicable CVE. Vulnerability Details ID:WS-2026-0003 DESCRIPTION: The non-blocking async JSON parser in jackson-core bypasses the maxNumberLength constraint default: 1000 characters defined i...

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

Summary IBM SPSS Analytic Server 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...

Security Bulletin: There is a vulnerability in jackson-core-2.15.1.jar used by IBM Maximo Manage application in IBM Maximo Application Suite (WS-2026-0003)

Summary There is a vulnerability in jackson-core-2.15.1.jar used by IBM Maximo Manage application in IBM Maximo Application Suite. Vulnerability Details ID:WS-2026-0003 DESCRIPTION: The non-blocking async JSON parser in jackson-core bypasses the maxNumberLength constraint default: 1000 characters...

Security Bulletin: Due to use of jackson-core-2.19.4.jar, IBM Sterling Connect:Direct Web Services is affected by Denial of Service (DoS) issue.

Summary jackson-core-2.19.4.jar is used by IBM Sterling Connect:Direct Web Services WS-2026-0003. Vulnerability Details ID:WS-2026-0003 DESCRIPTION: The non-blocking async JSON parser in jackson-core bypasses the maxNumberLength constraint default: 1000 characters defined in StreamReadConstraints...

jackson-core -- StreamReadConstraints can be bypassed

The Jackson project reports: Enforce maxNameLength incrementally in ReaderBasedJsonParser Fail parsing from DataInput if StreamReadConstraints.getMaxDocumentLength set Fix maxDocumentLength bypass in async parser single feedInput case Enforce StreamReadConstraints.maxNumberLength for non-blocking...

GHSA-72HV-8253-57QQ jackson-core: Number Length Constraint Bypass in Async Parser Leads to Potential DoS Condition

Summary The non-blocking async JSON parser in jackson-core bypasses the maxNumberLength constraint default: 1000 characters defined in StreamReadConstraints. This allows an attacker to send JSON with arbitrarily long numbers through the async parser API, leading to excessive memory allocation and...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in which the non-blocking async JSON parser can be made to bypass the maxNumberLength constraint default: 1000 characters defined in StreamReadConstraints. An attacker can cause...

jackson-core: Number Length Constraint Bypass in Async Parser Leads to Potential DoS Condition

Summary The non-blocking async JSON parser in jackson-core bypasses the maxNumberLength constraint default: 1000 characters defined in StreamReadConstraints. This allows an attacker to send JSON with arbitrarily long numbers through the async parser API, leading to excessive memory allocation and...

PT-2026-67715

Name of the Vulnerable Software and Affected Versions jackson-core versions 2.15.0 through 2.18.5 jackson-core versions 2.19.0 through 2.21.0 jackson-core versions 3.0.0 through 3.0.x Description The non-blocking asynchronous JSON parser in jackson-core fails to enforce the maxNumberLength...