Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a null byte) raises an exception, but only after freeing the document's current encoding string without replacing it. The document is left referencing freed memory, so the next call to Document#encoding reads invalid memory, which can cause a segfault or leak freed bytes into a Ruby String. Affects the CRuby (libxml2) implementation only; JRuby is not affected. This vulnerability is fixed in 1.19.4.

An update of the rubygem package has been released.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50221 advisory.

    Red Hat Satellite is a system management solution that allows organizations     to configure and maintain their systems without the necessity to provide     public Internet access to their servers or other client systems. It     performs provisioning and configuration management of predefined standard     operating environments.

    Security Fix(es):

    * rubygem-katello: missing repository authorization in content_uploads exposes cross-product content     existence (CVE-2026-12515)
    * openvox-server: HTTP request smuggling via chunked extension quoted-string parsing (CVE-2026-2332)
    * rubygem-faraday: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday_middleware: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-cookie_jar: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-em_http: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-em_synchrony: Faraday: Denial of Service via crafted nested query strings     (CVE-2026-54297)
    * rubygem-faraday-excon: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-httpclient: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-multipart: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-net_http: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-net_http_persistent: Faraday: Denial of Service via crafted nested query strings     (CVE-2026-54297)
    * rubygem-faraday-patron: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-rack: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-faraday-retry: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)
    * rubygem-nokogiri: Nokogiri: Denial of Service or Information Disclosure via invalid encoding handling     (CVE-2026-57236)
    * python-pillow: Pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)
    * python-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)
    * python-pillow: Pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)
    * python-pillow: Pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

The remote Redhat Enterprise Linux 8 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50223 advisory.

    Red Hat Satellite is a system management solution that allows organizations     to configure and maintain their systems without the necessity to provide     public Internet access to their servers or other client systems. It     performs provisioning and configuration management of predefined standard     operating environments.

    Security Fix(es):

    * puppet-agent: Out-of-bounds read & write in RFC 3211 KEK Unwrap (CVE-2025-9230)

    * puppetserver: HTTP request smuggling via chunked extension quoted-string parsing (CVE-2026-2332)

    * python-pillow: Pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)

    * python-pillow: Pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)

    * python-pillow: Pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)

    * python-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)

    * python-pillow: Pillow: Native heap out-of-bounds write (CVE-2026-59197)

    * python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)

    * rubygem-faraday-cookie_jar: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-em_http: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-em_synchrony: Faraday: Denial of Service via crafted nested query strings     (CVE-2026-54297)

    * rubygem-faraday-excon: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-httpclient: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday_middleware: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-multipart: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-net_http: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-net_http_persistent: Faraday: Denial of Service via crafted nested query strings     (CVE-2026-54297)

    * rubygem-faraday-patron: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-rack: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-faraday-retry: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * rubygem-katello: missing repository authorization in content_uploads exposes cross-product content     existence (CVE-2026-12515)

    * rubygem-nokogiri: Nokogiri: Denial of Service or Information Disclosure via invalid encoding handling     (CVE-2026-57236)

    * libsolv: Heap buffer overflow in libsolv repopagestore via unchecked decompression of malicious .solv     page data (CVE-2026-48864)

    Bug Fix(es):

    * scap-security-guide-satellite: Update of scap-security-guide-satellite package sources

    * 'Katello::Errors::Pulp3Error: nextval: reached maximum value of sequence     container_blobmanifest_id_seq' during container image sync

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50222 advisory.

    Red Hat Satellite is a system management solution that allows organizations     to configure and maintain their systems without the necessity to provide     public Internet access to their servers or other client systems. It     performs provisioning and configuration management of predefined standard     operating environments.

    Security Fix(es):

    * puppet-agent: Out-of-bounds read & write in RFC 3211 KEK Unwrap (CVE-2025-9230)

    * rubygem-katello: missing repository authorization in content_uploads exposes cross-product content     existence (CVE-2026-12515)

    * puppetserver: HTTP request smuggling via chunked extension quoted-string parsing (CVE-2026-2332)

    * python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)

    * python-pillow: Pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)

    * python-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)

    * rubygem-faraday-cookie_jar: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * python-pillow: Pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)

    * python-pillow: Pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)

    * rubygem-nokogiri: Nokogiri: Denial of Service or Information Disclosure via invalid encoding handling     (CVE-2026-57236)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page(s) listed in the References section.

    Bug Fix(es):

    * API endpoint GET /api/host_packages/installed_packages in apidoc is wrong (SAT-48096)

    * Unable to save bookmark report under Hosts > All Hosts > Compliance > Reports (SAT-48150)

    * Update of scap-security-guide-satellite package sources (SAT-48147)

    * Switch Satellite 6.17 to OpenVox (SAT-44867)

    * Katello::Errors::Pulp3Error: nextval: reached maximum value of sequence container_blobmanifest_id_seq'     during container image sync (SAT-48303)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:50263 advisory.

    Red Hat Satellite is a system management solution that allows organizations     to configure and maintain their systems without the necessity to provide     public Internet access to their servers or other client systems. It     performs provisioning and configuration management of predefined standard     operating environments.

    Security Fix(es):

    * puppetserver: HTTP request smuggling via chunked extension quoted-string parsing (CVE-2026-2332)

    * python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens (CVE-2026-48526)

    * rubygem-katello: missing repository authorization in content_uploads exposes cross-product content     existence (CVE-2026-12515)

    * rubygem-faraday-rack: Faraday: Denial of Service via crafted nested query strings (CVE-2026-54297)

    * python3.12-pillow: Pillow: Denial of Service via crafted BDF font file (CVE-2026-55379)

    * python3.12-pillow: Pillow: Denial of Service via crafted GD 2.x image file (CVE-2026-55380)

    * python3.12-pillow: Pillow: Denial of Service via crafted PCF font data (CVE-2026-54059)

    * python3.12-pillow: Pillow: Denial of Service via excessive memory allocation when processing font files     (CVE-2026-54060)

    * rubygem-nokogiri: Nokogiri: Denial of Service or Information Disclosure via invalid encoding handling     (CVE-2026-57236)

    * puppet-agent: Out-of-bounds read & write in RFC 3211 KEK Unwrap (CVE-2025-9230)

    Bug Fix(es):

    * Backport OpenVox Server and Agent Packaging to Satellite and Capsule 6.18 (SAT-44866)

    * Update of scap-security-guide-satellite package sources (SAT-48160)

    * API endpoint GET /api/host_packages/installed_packages in apidoc is wrong (SAT-48161)

    * Unable to save bookmark report under  Hosts  All Hosts  Compliance  Reports (SAT-48162)

    * 'Katello::Errors::Pulp3Error: nextval: reached maximum value of sequence     container_blobmanifest_id_seq' during container image sync (SAT-48302)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

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

  - Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4,     calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a null     byte) raises an exception, but only after freeing the document's current encoding string without replacing     it. The document is left referencing freed memory, so the next call to Document#encoding reads invalid     memory, which can cause a segfault or leak freed bytes into a Ruby String. Affects the CRuby (libxml2)     implementation only; JRuby is not affected. This vulnerability is fixed in 1.19.4. (CVE-2026-57236)

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

ID	Name	Product	Family	Type	Severity
332554	Photon OS 5.0: Rubygem PHSA-2026-5.0-91-0911	Nessus	PhotonOS Local Security Checks	Local	medium
331975	RHEL 9 : Satellite 6.19.3 Async Update (Important) (RHSA-2026:50221)	Nessus	Red Hat Local Security Checks	Local	medium
331972	RHEL 8 / 9 : Satellite 6.16.12 Async Update (Important) (RHSA-2026:50223)	Nessus	Red Hat Local Security Checks	Local	medium
331967	RHEL 9 : Satellite 6.17.10 Async Update (Important) (RHSA-2026:50222)	Nessus	Red Hat Local Security Checks	Local	medium
331961	RHEL 9 : Satellite 6.18.8 Async Update (Important) (RHSA-2026:50263)	Nessus	Red Hat Local Security Checks	Local	medium
325379	Photon OS 4.0: Rubygem PHSA-2026-4.0-1051	Nessus	PhotonOS Local Security Checks	Local	medium
324558	Photon OS 5.0: Rubygem PHSA-2026-5.0-0911	Nessus	PhotonOS Local Security Checks	Local	medium
323616	Linux Distros Unpatched Vulnerability : CVE-2026-57236	Nessus	Misc.	Local	medium

Detections

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CVE-2026-57236

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Tenable Plugins

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