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.

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	Severity
325969	Photon OS 4.0: Rubygem PHSA-2026-4.0-1052	Nessus	PhotonOS Local Security Checks	high
325967	Photon OS 5.0: Rubygem PHSA-2026-5.0-0917	Nessus	PhotonOS Local Security Checks	medium
324683	Linux Distros Unpatched Vulnerability : CVE-2026-54592	Nessus	Misc.	high
443736	SCA: security update for oj (GHSA-3m6q-jj5j-38c9)	Tenable Cloud Security	SCA Checks	high
443736	SCA: security update for oj (GHSA-3m6q-jj5j-38c9)	Tenable Self-Hosted Container Security	SCA Checks	high

Detections

Analytics

CVE-2026-54592

high

Tenable Plugins

high

medium

high

high

high