CVE-2026-54901— Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-54901
Vulnerability Information
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Vulnerability Title
Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking
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 3.17.2, Oj::Parser in usual mode does not mark array_class and hash_class references during garbage collection, leading to Use-After-Free. If GC runs after the class is assigned but before a parse, the class object is reclaimed, leaving the parser holding a dangling VALUE. The subsequent parse call dereferences the freed object, producing a segfault. 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Oj::Parser在常规模式下未标记array_class和hash_class引用，导致释放后重用，如果垃圾回收在类分配后但解析前运行，类对象被回收，解析器持有悬空VALUE，后续解析调用解引用已释放对象，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
II. Public POCs for CVE-2026-54901
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Vendor Advisories for CVE-2026-54901 (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-2026-54902 | Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback | |
| 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
- CVE-2026-54903
Oj: Integer Overflow in Oj.load 2GB String Handling - CVE-2026-54902
Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback - CVE-2026-54900
Oj: Negative-Size memcpy in Oj::Parser create_id Attribute H - CVE-2026-54898
Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Muta - CVE-2026-54897
Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close
Same vendor: ohler55
- CVE-2026-54903
Oj: Integer Overflow in Oj.load 2GB String Handling - CVE-2026-54902
Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback - CVE-2026-54900
Oj: Negative-Size memcpy in Oj::Parser create_id Attribute H - CVE-2026-54898
Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Muta - CVE-2026-54897
Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close
Same weakness: CWE-416
- CVE-2026-12366
Use-after-free freeing an armed dynamically-allocated k_time - CVE-2026-12365
Use-after-free in Zephyr delayable work-queue cancellation u - CVE-2026-11937
Security vulnerabilities have been found in IBM Verify Ident - CVE-2026-19548
Binutils: binutils: multiple use-after-free in add_archive_e - CVE-2026-19560
Google Chrome 资源管理错误漏洞
V. Comments for CVE-2026-54901
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