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org.apache.logging.log4j:log4j-api

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Medium, CVSS 6.3MavenPublished

    Apache Log4j API: Improper encoding of non-finite floating-point values during MapMessage JSON serialization

    CVE-2026-49844 · GHSA-qv9r-c865-cp47

    Affected
    • Maven org.apache.logging.log4j:log4j-api >= 2.13.1, < 2.25.5; >= 2.26.0, < 2.26.1
    Fixed in
    2.25.52.26.1· Vendor fix available
    Issue
    Improper encoding of non-finite floating-point values during MapMessage JSON serialization in Apache Log4j API produces output that is not valid JSON. This issue affects Apache Log4j API versions 2.13.1 through 2.25.4 and version 2.26.0. The fix for CVE-2026-34481 did not cover all code paths: when a MapMessage contains a non-finite IEEE 754 value (NaN, Infinity, or -Infinity), MapMessage.asJson() emits the corresponding bare token. RFC 8259 does not permit these tokens, so a conformant parser rejects the resulting document. The defect is reachable only when both of the following conditions hold: The application uses the message resolver https://logging.apache.org/log4j/2.x/manual/json-template-layout.html#event-template-resolver-message of JsonTemplateLayout or any other layout that relies on MapMessage.asJson() or MapMessage.getFormattedMessage(new String[]{"JSON"}). The application logs a MapMessage that contains an attacker-controlled floating-point value. An attacker who can…

    Recommended action: Upgrade to 2.26.1 or 2.25.5 by release line, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:github.comSource checked Evidence →