CVE-2026-18401
A remote anonymous attacker can exploit a vulnerability in FasterXML Jackson to conduct a denial of service attack.
CSIRTS triage
- What
- A vulnerability in FasterXML Jackson allows remote anonymous attackers to conduct a denial of service attack.
- Who is affected
- Applications using FasterXML Jackson and processing untrusted input are affected.
- Urgency
- Medium severity; denial of service is possible but not as critical as remote code execution.
- Action
- Update FasterXML Jackson to a patched version addressing CVE-2026-18401.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.
Advisory coverage (2)
- medium[UPDATE] [medium] FasterXML Jackson: Vulnerability enables denial of servicecert-bund · 2026-08-05
- unknownCVE-2026-18401: The non-blocking (asynchronous) JSON parser in jackson-core does not enforce the maxNumberLeng…nvd · 2026-08-04
External references
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[](https://www.csirts.com/cve/CVE-2026-18401)