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CVE-2026-54902— Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback

Quick assessment

Affected
ohler55 oj
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 3.17.2之前版本存在资源管理错误漏洞，该漏洞源于SAJ模式下存在释放后重用问题，Oj::Parser未保护缓存的键（≥35字节）免受垃圾回收影响，Ruby回调触发GC可能导致释放后访问，从而产生段错误。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
ohler55 oj < 3.17.2 affected
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I. Basic Information for CVE-2026-54902

Vulnerability Information
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Vulnerability Title
Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback
Source: CVE Program / CVE List V5
Vulnerability Description
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, is vulnerable to Use-After-Free when in SAJ mode. The Oj::Parser does not protect cached object keys (≥ 35 bytes) from garbage collection, and a Ruby callback that triggers GC inside hash_end can cause the key string to be reclaimed while the C parser still holds a pointer to it. The subsequent access to the freed string VALUE results in a segfault, confirmed by an RIP pointing to address 0x4242 (a canary-style pattern suggesting control over the freed memory's content). This issue has been fixed in version 3.17.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Peter Ohler oj 资源管理错误漏洞
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 3.17.2之前版本存在资源管理错误漏洞，该漏洞源于SAJ模式下存在释放后重用问题，Oj::Parser未保护缓存的键（≥35字节）免受垃圾回收影响，Ruby回调触发GC可能导致释放后访问，从而产生段错误。
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 < 3.17.2 -

II. Public POCs for CVE-2026-54902

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III. Intelligence Information for CVE-2026-54902

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Vendor Advisories for CVE-2026-54902 (1)

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

CVE-2026-54592 7.5 HIGH Oj: Stack Buffer Overflow in Oj::Doc#each_child via Deeply Nested Input
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-2026-54901 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-416

V. Comments for CVE-2026-54902

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