Denial of service via unbounded JSON nesting
Published Jun 25, 2025 · Updated Jun 25, 2025
Denial of service in FasterXML Jackson Core before 2.15.0 allows remote attackers to crash parsing applications via deeply nested JSON. The streaming parser creates nested JsonReadContext states without enforcing a depth bound, allowing recursion to exhaust the Java call stack. Exposure requires an application to pass attacker-controlled JSON to an affected parser; the bounded consequence is an application or service crash.
Summary
What happened
Denial of service in FasterXML Jackson Core before 2.15.0 allows remote attackers to crash parsing applications via deeply nested JSON. The streaming parser creates nested JsonReadContext states without enforcing a depth bound, allowing recursion to exhaust the Java call stack. Exposure requires an application to pass attacker-controlled JSON to an affected parser; the bounded consequence is an application or service crash.
The record
- CVE
- CVE-2025-52999
- Published
- Jun 25, 2025
- Updated
- Jun 25, 2025
- Vendor
- FasterXML
- Product
- Jackson Core
- Classifications
- CWE-121, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 25, 2025CVE publishedPublication date reported by the CVE source.
- Jun 25, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.15.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- SAS CVE-2025-52999 nesting-depth regression testproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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