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.

The version of the oj Ruby gem installed on the remote host is prior to 3.17.3. It is, therefore, affected by multiple vulnerabilities:

  - 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. (CVE-2026-54592)

  - 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. (CVE-2026-54500)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the rubygem package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-54592)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-54592)

ID	Name	Product	Family	Type	Severity
333328	Ruby oj Gem < 3.17.3 Multiple Vulnerabilities	Nessus	Misc.	Local	medium
332369	Photon OS 5.0: Rubygem PHSA-2026-5.0-92-0917	Nessus	PhotonOS Local Security Checks	Local	medium
325969	Photon OS 4.0: Rubygem PHSA-2026-4.0-1052	Nessus	PhotonOS Local Security Checks	Local	high
325967	Photon OS 5.0: Rubygem PHSA-2026-5.0-0917	Nessus	PhotonOS Local Security Checks	Local	medium
324683	Linux Distros Unpatched Vulnerability : CVE-2026-54592	Nessus	Misc.	Local	high
443736	SCA: security update for oj (GHSA-3m6q-jj5j-38c9)	Tenable Cloud Security	SCA Checks	Local	high
443736	SCA: security update for oj (GHSA-3m6q-jj5j-38c9)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-54592

high

Tenable Plugins

medium

medium

high

medium

high

high

high