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CVE-2026-34481 is a high severity vulnerability with a CVSS score of 7.5. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
Apache Log4j's JsonTemplateLayout, in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values (NaN, Infinity, or -Infinity), which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to index affected records.
An attacker can exploit this issue only if both of the following conditions are met:
JsonTemplateLayout.MapMessage containing an attacker-controlled floating-point value.Users are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue.
| Vendor | Product |
|---|---|
| Apache | Log4j |
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