JVM heap exhaustion via deferred integer validation
Published Aug 4, 2026 · Updated Aug 4, 2026
Denial of service in affected FasterXML Jackson Core releases allows remote attackers to exhaust JVM heap via chunked JSON input. The non-blocking parser returns NOT_AVAILABLE from integer-digit states without calling validateIntegerLength, so TextBuffer expands toward maxStringLength instead of the configured maxNumberLength. Exploitation requires an unauthenticated streaming endpoint that feeds incomplete JSON chunks to the async parser; synchronous parsing and complete-input async parsing are unaffected.
Summary
What happened
Denial of service in affected FasterXML Jackson Core releases allows remote attackers to exhaust JVM heap via chunked JSON input. The non-blocking parser returns NOT_AVAILABLE from integer-digit states without calling validateIntegerLength, so TextBuffer expands toward maxStringLength instead of the configured maxNumberLength. Exploitation requires an unauthenticated streaming endpoint that feeds incomplete JSON chunks to the async parser; synchronous parsing and complete-input async parsing are unaffected.
The record
- CVE
- CVE-2026-68494
- Published
- Aug 4, 2026
- Updated
- Aug 4, 2026
- Vendor
- FasterXML
- Product
- Jackson Core
- Classifications
- CWE-770, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 4, 2026CVE publishedPublication date reported by the CVE source.
- Aug 4, 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=2.15.0 <2.18.8
- Affected versionversion=2.19.0 <2.21.4
- Affected versionversion=2.22.0 <2.22.1
- Affected versionversion=3.0.0 <3.1.4
- Affected versionversion=3.2.0 <3.2.1
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
- Upstream standalone Java proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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