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CVE-2026-54592— Oj: Stack Buffer Overflow in Oj::Doc#each_child via Deeply Nested Input

Quick assessment

Affected
ohler55 oj
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Peter Ohler oj是Peter Ohler个人开发者的一个高效JSON解析与代码生成的前端库。 Peter Ohler oj 3.17.3之前版本存在缓冲区错误漏洞，该漏洞源于Oj::Doc#each_child在递归处理深层嵌套JSON文档时，未对固定大小栈缓冲区进行边界检查导致缓冲区溢出，可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.28% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
ohler55 oj < 3.17.3 affected
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I. Basic Information for CVE-2026-54592

Vulnerability Information
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Vulnerability Title
Oj: Stack Buffer Overflow in Oj::Doc#each_child via Deeply Nested Input
Source: CVE Program / CVE List V5
Vulnerability Description
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj::Doc#each_child, when invoked recursively over a deeply nested JSON document, overflows a fixed-size stack buffer and aborts the process, leading to DoS. In a two-step chain in ext/oj/fast.c, doc_each_child increments doc->where past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc->where-- is missing), so calling each_child recursively from inside the yield block drives doc->where beyond the array. On the next entry the function copies the path into the 800-byte stack-local buffer save_path[MAX_STACK] using wlen = doc->where - doc->where_path, so when the previous recursive call left doc->where past where_path[100] the wlen exceeds MAX_STACK and the memcpy overflows save_path on the C stack; because the Oj::Doc parser imposes no JSON nesting-depth limit (relying on a C-stack pressure check), deeply nested attacker input reaches this path. This issue has been fixed in version 3.17.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Peter Ohler oj 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Peter Ohler oj是Peter Ohler个人开发者的一个高效JSON解析与代码生成的前端库。 Peter Ohler oj 3.17.3之前版本存在缓冲区错误漏洞，该漏洞源于Oj::Doc#each_child在递归处理深层嵌套JSON文档时，未对固定大小栈缓冲区进行边界检查导致缓冲区溢出，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ohler55 oj < 3.17.3 -

II. Public POCs for CVE-2026-54592

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Qwen3.6-35B-A3B · 6064 chars
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III. Intelligence Information for CVE-2026-54592

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Vendor Advisories for CVE-2026-54592 (1)

Same Patch Batch · ohler55 · 2026-06-30 · 11 CVEs total

CVE-2026-54500 5.3 MEDIUM Oj: intern.c form_attr has an uninitialized stack read
CVE-2026-54897 Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close
CVE-2026-54903 Oj: Integer Overflow in Oj.load 2GB String Handling
CVE-2026-54899 Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle
CVE-2026-54902 Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback
CVE-2026-54901 Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking
CVE-2026-54900 Oj: Negative-Size memcpy in Oj::Parser create_id Attribute Handling
CVE-2026-54896 Oj: Heap Buffer Overflow in Oj.dump Exception Serialization via Large Indent
CVE-2026-54502 Oj: Stack Buffer Overflow in Oj.dump via Large Indent
CVE-2026-54898 Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Mutation

IV. Related Vulnerabilities

Same product: oj
Same vendor: ohler55
Same weakness: CWE-125

V. Comments for CVE-2026-54592

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