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.

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     3.17.2,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. (CVE-2026-54898)

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
    3.17.2,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. (CVE-2026-54898)

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
324668	Linux Distros Unpatched Vulnerability : CVE-2026-54898	Nessus	Misc.	low
443735	SCA: security update for oj (GHSA-q2gm-54r6-8fwm)	Tenable Cloud Security	SCA Checks	low
443735	SCA: security update for oj (GHSA-q2gm-54r6-8fwm)	Tenable Self-Hosted Container Security	SCA Checks	low

Detections

Analytics

CVE-2026-54898

low

Tenable Plugins

high

medium

low

low

low