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.

The remote Debian 12 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4803 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4803-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                        Simon Quigley     September 30, 2026                            https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : ruby-oj     Version        : 3.14.2-1+deb12u1     CVE ID         : CVE-2026-54500 CVE-2026-54502 CVE-2026-54592 CVE-2026-54896                      CVE-2026-54897 CVE-2026-54898 CVE-2026-54899 CVE-2026-54900                      CVE-2026-54901 CVE-2026-54902 CVE-2026-54903

    Multiple security vulnerabilities were discovered in Oj, a fast JSON     parser and serializer for Ruby, which could result in denial of service     or memory disclosure.

    For Debian 12 bookworm, these problems have been fixed in version     3.14.2-1+deb12u1.

    We recommend that you upgrade your ruby-oj packages.

    For the detailed security status of ruby-oj please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/ruby-oj

    Further information about Debian LTS security advisories, how to apply     these updates to your system, and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

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     3.17.2, 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. (CVE-2026-54896)

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, 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. (CVE-2026-54896)

ID	Name	Product	Family	Type	Severity
353437	Debian dla-4803 : ruby-oj - security update	Nessus	Debian Local Security Checks	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
324706	Linux Distros Unpatched Vulnerability : CVE-2026-54896	Nessus	Misc.	Local	low
443713	SCA: security update for oj (GHSA-35w3-pjm6-wj95)	Tenable Cloud Security	SCA Checks	Local	low
443713	SCA: security update for oj (GHSA-35w3-pjm6-wj95)	Tenable Self-Hosted Container Security	SCA Checks	Local	low

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CVE-2026-54896

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