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CVE-2026-54903 (GCVE-0-2026-54903)

Vulnerability from nvd – Published: 2026-06-30 23:42 – Updated: 2026-07-01 12:43

Title

Oj: Integer Overflow in Oj.load 2GB String Handling

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                "id": "CVE-2026-54903",
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      }
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CVE-2026-54902 (GCVE-0-2026-54902)

Vulnerability from nvd – Published: 2026-06-30 23:40 – Updated: 2026-07-01 12:37

Title

Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback

Summary

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.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54901 (GCVE-0-2026-54901)

Vulnerability from nvd – Published: 2026-06-30 23:36 – Updated: 2026-07-01 12:34

Title

Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking

Summary

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.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54900 (GCVE-0-2026-54900)

Vulnerability from nvd – Published: 2026-06-30 23:34 – Updated: 2026-07-01 15:48

Title

Oj: Negative-Size memcpy in Oj::Parser create_id Attribute Handling

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in usual mode with create_id enabled, Oj::Parser#parse is vulnerable to heap corruption via a negative-size memcpy. When a JSON object key is exactly 65,535 bytes long, an integer truncation in form_attr (usual.c:63) converts the length to -1 before passing it to memcpy. This causes memcpy to copy SIZE_MAX bytes (interpreted as a huge size_t), corrupting heap memory and crashing the process. The issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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  },
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CVE-2026-54899 (GCVE-0-2026-54899)

Vulnerability from nvd – Published: 2026-06-30 23:03 – Updated: 2026-07-01 14:26

Title

Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, disabling symbol_keys on a reused Oj::Parser instance triggers a heap use-after-free. When symbol_keys is toggled from true to false, opt_symbol_keys_set frees the internal key cache (cache_free) but does not clear the pointer. The next parse call reads from the freed cache via cache_intern, producing a use-after-free. This issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54898 (GCVE-0-2026-54898)

Vulnerability from nvd – Published: 2026-06-30 23:24 – Updated: 2026-07-01 13:36

Title

Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Mutation

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string — for example by calling String#replace with a longer value — Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54897 (GCVE-0-2026-54897)

Vulnerability from nvd – Published: 2026-06-30 23:22 – Updated: 2026-07-01 12:43

Title

Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to 3.17.2, Oj::Doc iterators (each_value, each_child, each_leaf) were vulnerable to a heap use-after-free. When a Ruby block yielded during iteration calls doc.close or d.close, the document's heap memory is freed while the C iterator is still running. When control returns from the block, the iterator reads from the freed region, producing a use-after-free accessible from pure Ruby. This issue has been fixed in version 3.17.2.

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54896 (GCVE-0-2026-54896)

Vulnerability from nvd – Published: 2026-06-30 23:20 – Updated: 2026-07-01 12:39

Title

Oj: Heap Buffer Overflow in Oj.dump Exception Serialization via Large Indent

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in object mode, Oj.dump is vulnerable to a heap buffer overflow when serializing Exception objects with a large :indent value. The serializer allocates a buffer sized for the object's attributes but does not account for the indent bytes added on each write. With indent: 5000, the accumulation of 5,000-byte indent strings overflows the 13,150-byte heap allocation, corrupting adjacent heap memory. This issue has been fixed in version 3.17.2.

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54592 (GCVE-0-2026-54592)

Vulnerability from nvd – Published: 2026-06-30 23:16 – Updated: 2026-07-01 12:35

Title

Oj: Stack Buffer Overflow in Oj::Doc#each_child via Deeply Nested Input

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.3

Show details on NVD website

JSON

To clipboard

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            "url": "https://github.com/ohler55/oj/security/advisories/GHSA-3m6q-jj5j-38c9"
          }
        ],
        "title": "CISA ADP Vulnrichment"
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    ],
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          "lang": "en",
          "value": "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-\u003ewhere past the where_path[MAX_STACK = 100] array with no bounds check and never restores it (the doc-\u003ewhere-- is missing), so calling each_child recursively from inside the yield block drives doc-\u003ewhere 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-\u003ewhere - doc-\u003ewhere_path, so when the previous recursive call left doc-\u003ewhere 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."
        }
      ],
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          ]
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        }
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        "advisory": "GHSA-3m6q-jj5j-38c9",
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      },
      "title": "Oj: Stack Buffer Overflow in Oj::Doc#each_child via Deeply Nested Input"
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CVE-2026-54502 (GCVE-0-2026-54502)

Vulnerability from nvd – Published: 2026-06-30 23:10 – Updated: 2026-07-01 15:50

Title

Oj: Stack Buffer Overflow in Oj.dump via Large Indent

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the developer. fill_indent in dump.h calls memset(indent_str, ' ', (size_t)opts->indent) without validating the size. When opts->indent is set to INT_MAX (2,147,483,647), the (size_t) cast preserves the large value and memset writes 2 GB into the stack-allocated out buffer (4,184 bytes), corrupting the stack and crashing the process. This issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54500 (GCVE-0-2026-54500)

Vulnerability from nvd – Published: 2026-06-30 23:08 – Updated: 2026-07-01 14:26

Title

Oj: intern.c form_attr has an uninitialized stack read

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, `b`, populating it with the attribute name, and then freeing it — but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is >= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. This issue has been fixed in version 3.17.3.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-908 - Use of Uninitialized Resource

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-54903 (GCVE-0-2026-54903)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:42 – Updated: 2026-07-01 12:43

Title

Oj: Integer Overflow in Oj.load 2GB String Handling

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54902 (GCVE-0-2026-54902)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:40 – Updated: 2026-07-01 12:37

Title

Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback

Summary

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.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54901 (GCVE-0-2026-54901)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:36 – Updated: 2026-07-01 12:34

Title

Oj: Use-After-Free in Oj::Parser array_class/hash_class GC Marking

Summary

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.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54900 (GCVE-0-2026-54900)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:34 – Updated: 2026-07-01 15:48

Title

Oj: Negative-Size memcpy in Oj::Parser create_id Attribute Handling

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in usual mode with create_id enabled, Oj::Parser#parse is vulnerable to heap corruption via a negative-size memcpy. When a JSON object key is exactly 65,535 bytes long, an integer truncation in form_attr (usual.c:63) converts the length to -1 before passing it to memcpy. This causes memcpy to copy SIZE_MAX bytes (interpreted as a huge size_t), corrupting heap memory and crashing the process. The issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54898 (GCVE-0-2026-54898)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:24 – Updated: 2026-07-01 13:36

Title

Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Mutation

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string — for example by calling String#replace with a longer value — Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54897 (GCVE-0-2026-54897)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:22 – Updated: 2026-07-01 12:43

Title

Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to 3.17.2, Oj::Doc iterators (each_value, each_child, each_leaf) were vulnerable to a heap use-after-free. When a Ruby block yielded during iteration calls doc.close or d.close, the document's heap memory is freed while the C iterator is still running. When control returns from the block, the iterator reads from the freed region, producing a use-after-free accessible from pure Ruby. This issue has been fixed in version 3.17.2.

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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        }
      ],
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CVE-2026-54896 (GCVE-0-2026-54896)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:20 – Updated: 2026-07-01 12:39

Title

Oj: Heap Buffer Overflow in Oj.dump Exception Serialization via Large Indent

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in object mode, Oj.dump is vulnerable to a heap buffer overflow when serializing Exception objects with a large :indent value. The serializer allocates a buffer sized for the object's attributes but does not account for the indent bytes added on each write. With indent: 5000, the accumulation of 5,000-byte indent strings overflows the 13,150-byte heap allocation, corrupting adjacent heap memory. This issue has been fixed in version 3.17.2.

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54592 (GCVE-0-2026-54592)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:16 – Updated: 2026-07-01 12:35

Title

Oj: Stack Buffer Overflow in Oj::Doc#each_child via Deeply Nested Input

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-54502 (GCVE-0-2026-54502)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:10 – Updated: 2026-07-01 15:50

Title

Oj: Stack Buffer Overflow in Oj.dump via Large Indent

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the developer. fill_indent in dump.h calls memset(indent_str, ' ', (size_t)opts->indent) without validating the size. When opts->indent is set to INT_MAX (2,147,483,647), the (size_t) cast preserves the large value and memset writes 2 GB into the stack-allocated out buffer (4,184 bytes), corrupting the stack and crashing the process. This issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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CVE-2026-54500 (GCVE-0-2026-54500)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:08 – Updated: 2026-07-01 14:26

Title

Oj: intern.c form_attr has an uninitialized stack read

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, `b`, populating it with the attribute name, and then freeing it — but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is >= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. This issue has been fixed in version 3.17.3.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-908 - Use of Uninitialized Resource

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.3

Show details on NVD website

JSON

To clipboard

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          "product": "oj",
          "vendor": "ohler55",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.17.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, `b`, populating it with the attribute name, and then freeing it \u2014 but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is \u003e= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. This issue has been fixed in version 3.17.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-908",
              "description": "CWE-908: Use of Uninitialized Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-30T23:08:28.789Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/ohler55/oj/security/advisories/GHSA-fm7p-mprw-wjm9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/ohler55/oj/security/advisories/GHSA-fm7p-mprw-wjm9"
        }
      ],
      "source": {
        "advisory": "GHSA-fm7p-mprw-wjm9",
        "discovery": "UNKNOWN"
      },
      "title": "Oj: intern.c form_attr has an uninitialized stack read"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54500",
    "datePublished": "2026-06-30T23:08:28.789Z",
    "dateReserved": "2026-06-15T18:01:15.511Z",
    "dateUpdated": "2026-07-01T14:26:18.970Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-54899 (GCVE-0-2026-54899)

Vulnerability from cvelistv5 – Published: 2026-06-30 23:03 – Updated: 2026-07-01 14:26

Title

Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle

Summary

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, disabling symbol_keys on a reused Oj::Parser instance triggers a heap use-after-free. When symbol_keys is toggled from true to false, opt_symbol_keys_set frees the internal key cache (cache_free) but does not clear the pointer. The next parse call reads from the freed cache via cache_intern, producing a use-after-free. This issue has been fixed in version 3.17.2.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/ohler55/oj/security/advisories…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
ohler55	oj	Affected: < 3.17.2

Show details on NVD website

JSON

To clipboard

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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54899",
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                    "Exploitation": "poc"
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                    "Automatable": "no"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-01T13:38:09.223016Z",
                "version": "2.0.3"
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            "url": "https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r"
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          "value": "Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, disabling symbol_keys on a reused Oj::Parser instance triggers a heap use-after-free. When symbol_keys is toggled from true to false, opt_symbol_keys_set frees the internal key cache (cache_free) but does not clear the pointer. The next parse call reads from the freed cache via cache_intern, producing a use-after-free. This issue has been fixed in version 3.17.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
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            "privilegesRequired": "NONE",
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        "discovery": "UNKNOWN"
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      "title": "Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle"
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    "dateReserved": "2026-06-16T13:49:33.555Z",
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}

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22 vulnerabilities by ohler55

CVE-2026-54903 (GCVE-0-2026-54903)

CVE-2026-54902 (GCVE-0-2026-54902)

CVE-2026-54901 (GCVE-0-2026-54901)

CVE-2026-54900 (GCVE-0-2026-54900)

CVE-2026-54899 (GCVE-0-2026-54899)

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CVE-2026-54897 (GCVE-0-2026-54897)

CVE-2026-54896 (GCVE-0-2026-54896)

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CVE-2026-54502 (GCVE-0-2026-54502)

CVE-2026-54500 (GCVE-0-2026-54500)

CVE-2026-54903 (GCVE-0-2026-54903)

CVE-2026-54902 (GCVE-0-2026-54902)

CVE-2026-54901 (GCVE-0-2026-54901)

CVE-2026-54900 (GCVE-0-2026-54900)

CVE-2026-54898 (GCVE-0-2026-54898)

CVE-2026-54897 (GCVE-0-2026-54897)

CVE-2026-54896 (GCVE-0-2026-54896)

CVE-2026-54592 (GCVE-0-2026-54592)

CVE-2026-54502 (GCVE-0-2026-54502)

CVE-2026-54500 (GCVE-0-2026-54500)

CVE-2026-54899 (GCVE-0-2026-54899)