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CVE-2026-49844 reproduction  |  log4j-api version: 2.25.5-fixed
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--- Path 1: getFormattedMessage(["JSON"]) with scalar Double values ---
  [double-scalar] value=NaN
    JSON output: {"number":"NaN"}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [double-scalar] value=Infinity
    JSON output: {"number":"Infinity"}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [double-scalar] value=-Infinity
    JSON output: {"number":"-Infinity"}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)

--- Path 1: getFormattedMessage(["JSON"]) with double[] arrays ---
  [double-array] value=NaN
    JSON output: {"numbers":["NaN"]}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [double-array] value=Infinity
    JSON output: {"numbers":["Infinity"]}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [double-array] value=-Infinity
    JSON output: {"numbers":["-Infinity"]}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)

--- Path 1: getFormattedMessage(["JSON"]) with scalar Float values ---
  [float-scalar] value=NaN
    JSON output: {"number":"NaN"}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [float-scalar] value=Infinity
    JSON output: {"number":"Infinity"}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [float-scalar] value=-Infinity
    JSON output: {"number":"-Infinity"}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)

--- Path 1: getFormattedMessage(["JSON"]) with float[] arrays ---
  [float-array] value=NaN
    JSON output: {"numbers":["NaN"]}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [float-array] value=Infinity
    JSON output: {"numbers":["Infinity"]}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)
  [float-array] value=-Infinity
    JSON output: {"numbers":["-Infinity"]}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)

--- Path 2: asJson(StringBuilder) direct call (protected) ---
  [asJson-direct] value=NaN/Inf/-Inf
    JSON output: {"inf":"Infinity","ninf":"-Infinity","number":"NaN"}
    >> non-finite value is QUOTED (valid JSON string)
    >> strict JSON parse OK (valid RFC 8259 JSON)

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SUMMARY (2.25.5-fixed)
  total cases tested        : 13
  bare NaN/Infinity tokens  : 0
  quoted NaN/Infinity tokens: 13
  JSON parse failures       : 0
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VERDICT|2.25.5-fixed|FIXED|bare=0|quoted=13|parseFail=0