Process crash via unchecked recursive path copy
Published Jun 30, 2026 · Updated Jun 30, 2026
Stack buffer overflow in Oj before 3.17.3 allows remote attackers to crash applications that recursively process deeply nested JSON. doc_each_child fails to restore or bound doc->where, then uses the excessive path length in memcpy into the fixed save_path stack buffer. Exploitation requires application code to recursively invoke Oj::Doc#each_child on attacker-controlled JSON; the demonstrated result is a protected-process abort, not code execution.
Summary
What happened
Stack buffer overflow in Oj before 3.17.3 allows remote attackers to crash applications that recursively process deeply nested JSON. doc_each_child fails to restore or bound doc->where, then uses the excessive path length in memcpy into the fixed save_path stack buffer. Exploitation requires application code to recursively invoke Oj::Doc#each_child on attacker-controlled JSON; the demonstrated result is a protected-process abort, not code execution.
The record
- CVE
- CVE-2026-54592
- Published
- Jun 30, 2026
- Updated
- Jun 30, 2026
- Vendor
- Peter Ohler
- Product
- Oj
- Classifications
- CWE-125, CWE-787, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 30, 2026CVE publishedPublication date reported by the CVE source.
- Jun 30, 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=< 3.17.3
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
- Recursive Oj::Doc#each_child abort proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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