Denial of service via unchecked JSON nesting depth
Published Mar 6, 2026 · Updated Mar 6, 2026
Denial of service in FasterXML Jackson Core 3.0.0 through 3.0.x allows remote attackers to interrupt apps with deeply nested JSON. UTF8DataInputJsonParser and ReaderBasedJsonParser directly create child read contexts, bypassing the helper that enforces StreamReadConstraints.maxNestingDepth. Exploitation requires an application to parse attacker-controlled JSON through an affected path; excessive nesting can raise a StackOverflowError and interrupt that application.
Summary
What happened
Denial of service in FasterXML Jackson Core 3.0.0 through 3.0.x allows remote attackers to interrupt apps with deeply nested JSON. UTF8DataInputJsonParser and ReaderBasedJsonParser directly create child read contexts, bypassing the helper that enforces StreamReadConstraints.maxNestingDepth. Exploitation requires an application to parse attacker-controlled JSON through an affected path; excessive nesting can raise a StackOverflowError and interrupt that application.
The record
- CVE
- CVE-2026-29062
- Published
- Mar 6, 2026
- Updated
- Mar 6, 2026
- Vendor
- FasterXML
- Product
- Jackson Core
- Classifications
- CWE-770, CWE-1284, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 6, 2026CVE publishedPublication date reported by the CVE source.
- Mar 6, 2026Record 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=>= 3.0.0, < 3.1.0
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
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Technologies
Your stack
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Your stack
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