GHSA-FM7P-MPRW-WJM9 Oj: intern.c form_attr (uninitialized stack read)

Summary 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. Details In ext/oj/intern.c, formattr handles the...

Oj: intern.c form_attr (uninitialized stack read)

Summary 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. Details In ext/oj/intern.c, formattr handles the...

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

Summary Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the developer. fillindent in dump.h calls memsetindentstr, ' ', sizetopts-indent without validating the size. When opts-indent is set to INTMAX 2,147,483,647, the sizet cast preserves the larg...

GHSA-3V45-F3VH-WG7M Oj: Stack Buffer Overflow in Oj.dump via Large Indent

Summary Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the developer. fillindent in dump.h calls memsetindentstr, ' ', sizetopts-indent without validating the size. When opts-indent is set to INTMAX 2,147,483,647, the sizet cast preserves the larg...

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

Summary Disabling symbolkeys on a reused Oj::Parser instance triggers a heap use-after-free. When symbolkeys is toggled from true to false, optsymbolkeysset frees the internal key cache cachefree but does not clear the pointer. The next parse call reads from the freed cache via cacheintern,...

Use After Free

Overview Affected versions of this package are vulnerable to Use After Free in the optsymbolkeysset. An attacker can cause the application to read from freed memory by toggling the symbolkeys option from true to false on a reused parser instance and then invoking the parse method. Remediation...

GHSA-2CW7-V8FF-P88R Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle

Summary Disabling symbolkeys on a reused Oj::Parser instance triggers a heap use-after-free. When symbolkeys is toggled from true to false, optsymbolkeysset frees the internal key cache cachefree but does not clear the pointer. The next parse call reads from the freed cache via cacheintern,...

PT-2026-51064

Name of the Vulnerable Software and Affected Versions Oj versions prior to 3.17.2 Description Oj.dump is subject to a stack-based buffer overflow when a large :indent value is provided. The fill indent function in dump.h utilizes memset to fill a buffer without validating the size of the indent...

PT-2026-51082

Name of the Vulnerable Software and Affected Versions Oj versions prior to 3.17.2 Description When operating in object mode, the Oj.dump function is susceptible to a heap buffer overflow during the serialization of Exception objects if a large :indent value is used. The issue occurs because the...

PT-2026-51086

Name of the Vulnerable Software and Affected Versions Oj versions prior to 3.17.2 Description When operating in usual mode with create id enabled, the Oj::Parserparse function is susceptible to heap corruption. This occurs when a JSON object key is exactly 65,535 bytes long, leading to an integer...

PT-2026-51067

Name of the Vulnerable Software and Affected Versions Oj versions prior to 3.17.3 Description When Oj::Doceach child is invoked recursively over a deeply nested JSON document, it can cause a fixed-size stack buffer overflow, leading to a denial of service DoS that aborts the process. This occurs...

PT-2026-51084

Name of the Vulnerable Software and Affected Versions oj gem affected versions not specified Description A heap use-after-free occurs in Oj::Parserparse when a SAJ/SAJ2 callback mutates the input JSON string during the parsing process. The C engine maintains a raw pointer to the Ruby string's...

PT-2026-51089

Name of the Vulnerable Software and Affected Versions Oj versions prior to 3.17.2 Description Oj is a JSON parser and Object marshaller for Ruby. The Oj.load function is susceptible to heap corruption when processing a JSON string exceeding 2 GB. An integer overflow occurs within the buf append...

PT-2026-51083

Name of the Vulnerable Software and Affected Versions Oj versions prior to 3.17.2 Description Oj::Doc iterators each value, each child, each leaf are subject to a heap use-after-free. This occurs when a Ruby block yielded during iteration calls doc.close or d.close, causing the document's heap...

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

Summary Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in bufappendstring buf.h:61 converts the string length to a large negative sizet, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process...

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

Summary Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the developer. fillindent in dump.h calls memsetindentstr, ' ', sizetopts-indent without validating the size. When opts-indent is set to INTMAX 2,147,483,647, the sizet cast preserves the larg...

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

Summary Oj::Parser in SAJ mode does not protect cached object keys ≥ 35 bytes from garbage collection. A Ruby callback that triggers GC inside hashend 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 i...

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

Summary Oj::Doc iterators eachvalue, eachchild, eachleaf are 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 rea...

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

Summary Oj::Parserparse in usual mode with createid enabled 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 formattr usual.c:63 converts the length to -1 before passing it to memcpy. This causes memcpy to...

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

Summary Disabling symbolkeys on a reused Oj::Parser instance triggers a heap use-after-free. When symbolkeys is toggled from true to false, optsymbolkeysset frees the internal key cache cachefree but does not clear the pointer. The next parse call reads from the freed cache via cacheintern,...