A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8910-1 advisory.

    Yirou Yang discovered that libxml2 incorrectly handled certain XML catalogs. If a user or automated system     was tricked into processing a specially crafted XML catalog, an attacker could possibly use this issue to     cause libxml2 to crash, resulting in a denial of service. (CVE-2026-76781)

    It was discovered that libxml2 incorrectly handled certain large qualified names, leading to a heap-based     buffer overflow. An attacker could possibly use this issue to cause libxml2 to crash, resulting in a     denial of service, or possibly execute arbitrary code. (CVE-2026-86138)

    It was discovered that libxml2 incorrectly handled escaping certain large URI strings. An attacker could     possibly use this issue to cause libxml2 to use excessive resources, leading to a denial of service. This     issue only affected Ubuntu 26.04 LTS. (CVE-2026-86139)

    Xudong Cao and Meng Xu discovered that libxml2 incorrectly handled certain large XPointer expressions,     leading to a heap-based buffer overflow. An attacker could possibly use this issue to cause libxml2 to     crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-86142)

    Xudong Cao and Meng Xu discovered that libxml2 did not check for integer overflows before passing output     lengths to write callbacks. An attacker could possibly use this issue to cause an application using     libxml2 to crash, resulting in a denial of service. (CVE-2026-86143)

    It was discovered that libxml2 did not apply parser options, such as disabling network access, when     processing XInclude directives under certain circumstances. An attacker could possibly use this issue to     perform XML external entity injection or server-side request forgery attacks, or cause a denial of     service. (CVE-2026-86144)

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

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

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

  - A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can
    trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element
    lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of
    Service (DoS). (CVE-2026-76781)

The remote Fedora 45 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-91259c13b9 advisory.

    libxml2 updated to version 2.15.4, compat libxml2_2.13 added, and rebuilds of packages linking to libxml2.
    Packages that FTBFS will require the compat package. It should be installed automatically by dnf if     required.

    ----

    Fix for CVE-2026-84975

    ----

    Prevent arbitrary code execution in flymake.


    ----

    Update to 51.0

    ----

    New upstream development version 1.57.3

    ----

    This release fixes handling SuSE metadata. We deliver it mainly to provide an up-to-date version string.


    ----

    LLVM 23.1.2 update

    ----

    Fix FTBFS with a modern radcli2

    ----

    ```
    * Tue Sep 08 2026 Klaus Wenninger <kwenning@redhat.com> - 3.0.3-1
    - Update for new upstream release tarball: Pacemaker-3.0.3,       for full details, see included ChangeLog.md file or       https://github.com/ClusterLabs/pacemaker/releases/tag/Pacemaker-3.0.3
    - move from deprecated py3_build & py3_install to       pyproject_wheel & pyproject_install
    - adapt python-package files to the new tooling
    - disable -Waggregate-return in cmocka files     ```

    ----

    **PHP version 8.5.11** (24 Sep 2026)

    **BCMath:**

    * Fixed out-of-bounds read in bc_is_zero_for_scale() when scale exceeds n_scale. (Ilia Alshanetsky)

    **Core:**

    * Fixed out-of-bounds reads during automatic UTF-16/32 encoding detection. (Yudai Takada)
    * Fixed bug [GH-15375](https://github.com/php/php-src/issues/15375) (Nested yield from skips items after     a valid() or next() call on the inner generator). (iliaal)
    * Fixed bug [GH-23232](https://github.com/php/php-src/issues/23232) (lone namespace separator asks the     autoloader for an empty class name). (spawnia)
    * Fixed bug [GH-23301](https://github.com/php/php-src/issues/23301) (Nested yield from yields a value     twice when the middle generator delegates again). (Lazizbek Ergashev)

    **DOM:**

    * Fixed NamedNodeMap::getNamedItemNS() with an empty URI not matching the null namespace in spec-following     mode. (Ilia Alshanetsky)
    * Fixed stale getElementsByClassName() and other node list caches after className/classList writes and     attribute removals. (Ilia Alshanetsky)
    * Fixed a use-after-free when cloning a DOMNameSpaceNode after DOMDocument::xinclude(). (iliaal)
    * Fixed a crash in DOMXPath when a php:function callback receives a nodeset and a later callback returns a     node from another document. (iliaal)
    * Fixed bug [GH-23331](https://github.com/php/php-src/issues/23331) (UAF when node_list_unlink() skips     attribute children that still have a live wrapper). (iliaal)
    * Fixed a use-after-free when Dom\Element::setAttributeNS() replaces the value of an attribute whose child     still has a live wrapper. (iliaal)

    **GD:**

    * Fixed imageaffinematrixget() and imageaffinematrixconcat() reporting the wrong argument in error     messages. (Weilin Du)

    **FPM:**

    * Fixed bug [GH-19320](https://github.com/php/php-src/issues/19320) (FPM UID and GID overflow). (Pratik     Bhujel)
    * Fixed [GHSA-62xp-839h-2637](https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637)     (IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison).
    (**CVE-2026-91768**) (Alexandre Daubois)

    **Intl:**

    * Fixed grapheme_strpos() and grapheme_strrpos() with an empty needle returning UTF-16 offsets instead of     grapheme offsets. (Ilia Alshanetsky)
    * Fixed a memory leak when dumping IntlCalendar instances. (Ilia Alshanetsky)
    * Fixed a memory leak when iterating IntlBreakIterator::getPartsIterator() results. (iliaal)
    * Fixed a double-free when IntlGregorianCalendar construction fails after the ICU constructor adopts the     TimeZone. (iliaal)
    * Fixed bug [GH-23094](https://github.com/php/php-src/issues/23094) (NumberFormatter parsing offsets use     UTF-16 positions for UTF-8 strings). (ColumbusLabs)
    * Fixed Locale::parseLocale() reading past a trailing '-' or '_'. (iliaal, Xuyang Zhang)
    * Fixed grapheme_str_split() treating UBRK_DONE as a byte index. (iliaal)
    * Fixed a leak in Locale::getKeywords() when a keyword value cannot be read. (iliaal)
    * Fixed a use-after-free when IntlRuleBasedBreakIterator is constructed from compiled rules. (iliaal)

    **MBString:**

    * Fixed mb_ereg_replace() emitting a NUL or out-of-bounds bytes in the replacement when a \k<name> backref     has no closing delimiter. (Ilia Alshanetsky)

    **MySQLnd:**

    * Fixed [GHSA-r6x9-5r99-36j7](https://github.com/php/php-src/security/advisories/GHSA-r6x9-5r99-36j7)     (Various packet overreads in mysqlnd wire protocol). (**CVE-2025-1218**) (Jakub Zelenka, Nora Dossche)

    **ODBC:**

    * Fixed odbc_field_len(), odbc_field_scale() and odbc_field_type() returning uninitialized memory when     SQLColAttribute fails. (Ilia Alshanetsky)

    **Opcache:**

    * Fixed opcache.protect_memory race under ZTS. (realFlowControl)
    * Fixed a tracing JIT crash when compiling a side trace for a method of a class that could not be stored     in the inheritance cache. ([GH-21710](https://github.com/php/php-src/issues/21710)) (Arnaud, iliaal)
    * Fixed a crash when the huge page SHM remap discarded mappings outside the reserved address range. (Piotr     Haas)

    **OpenSSL:**

    * Fixed [GHSA-vvx9-73fr-5jjx](https://github.com/php/php-src/security/advisories/GHSA-vvx9-73fr-5jjx) (TLS     hostname verification falls back to CN after SAN mismatch). (**CVE-2026-91769**) (Jakub Zelenka)
    * Fixed [GHSA-xr7j-rvgx-xq5p](https://github.com/php/php-src/security/advisories/GHSA-xr7j-rvgx-xq5p)     (Heap buffer overflow in php_openssl_matches_wildcard_name() on crafted server certificate wildcard CN).
    (**CVE-2026-91767**) (Jakub Zelenka)

    **PDO:**

    * Fixed a leak when a persistent connection failed a liveness check with no other live PDO handle.
    (iliaal)

    **PDO_PGSQL:**

    * Fixed PDO::CURSOR_SCROLL statements failing under lazy fetching (PDO::ATTR_PREFETCH => 0).
    (KentarouTakeda)

    **PDO Sqlite:**

    * Fixed bug [GH-20214](https://github.com/php/php-src/issues/20214) (PDO::FETCH_DEFAULT unexpected     behavior with PDOStatement::setFetchMode). (SakiTakamachi)

    **Phar:**

    * Fixed bug [GH-23418](https://github.com/php/php-src/issues/23418) (Use-after-free when looking up     mounted directories). (Weilin Du)
    * Fixed bug [GH-23477](https://github.com/php/php-src/issues/23477) (Memory leak on duplicate native Phar     manifest entries). (Weilin Du)
    * Fixed [GHSA-j3wh-g957-2m85](https://github.com/php/php-src/security/advisories/GHSA-j3wh-g957-2m85)     (Integer overflow in phar_tar_number() allowing TAR archive entry injection). (**CVE-2026-6103**) (Jakub     Zelenka)

    **Readline:**

    * Fixed the interactive shell not waiting for the pager process to exit. (Weilin Du)

    **SOAP:**

    * Fixed WSDL cache corruption when a soap:header defines headerfaults. (Ilia Alshanetsky)
    * Fixed stack overflow when parsing a WSDL with self-referential schema groups or attributeGroups. (Ilia     Alshanetsky)
    * Fixed [GHSA-rgrp-mwpx-f6rm](https://github.com/php/php-src/security/advisories/GHSA-rgrp-mwpx-f6rm)     (Unbounded recursion in server-side cleanup_xml_node()). (**CVE-2026-91765**) (Alexandre Daubois)
    * Fixed [GHSA-cj93-vc83-wgqv](https://github.com/php/php-src/security/advisories/GHSA-cj93-vc83-wgqv)     (Integer overflow to buffer overflow in SOAP HTTP parsing). (**CVE-2025-14181**) (Nora Dossche, Jakub     Zelenka)

    **Standard:**

    * Fixed a segfault when a stream filter callback unsets StreamBucket::$data before re-attaching the     bucket. (iliaal)
    * Fixed [GHSA-7875-c8px-7q5f](https://github.com/php/php-src/security/advisories/GHSA-7875-c8px-7q5f)     (Out-of-bounds read in the HTTP stream wrapper when following a redirect with an empty Location header).
    (**CVE-2026-93682**) (Ilia Alshanetsky, Jordi Kroon)
    * Fixed read buffer compaction in php_stream_filter_flush(). (crystarm)
    * Fixed bug [GH-22410](https://github.com/php/php-src/issues/22410) (Incorrect float behavior with large     numbers). (arshidkv12)
    * Fixed [GH-23338](https://github.com/php/php-src/issues/23338) (fsockopen()/pfsockopen() ValueError     reported wrong argument number for $timeout). (lacatoire)
    * Fixed bug [GH-23576](https://github.com/php/php-src/issues/23576) (Next index for array returned from     array_keys() is wrong). (Lazizbek Ergashev)
    * Fixed [GHSA-88hq-2827-7pg6](https://github.com/php/php-src/security/advisories/GHSA-88hq-2827-7pg6)     (Out-of-bounds read in convert.* stream filters when line-break-chars contains NUL). (**CVE-2026-92842**)     (geeknik)
    * Fixed [GHSA-fpwc-w8rq-cr92](https://github.com/php/php-src/security/advisories/GHSA-fpwc-w8rq-cr92)     (Cross-origin credential leak in HTTP stream wrapper redirects). (**CVE-2026-91766**) (Alexandre Daubois)

    **SimpleXML:**

    * Fixed writing to a dimension of the object returned by attributes() not creating the attribute. (Ilia     Alshanetsky)
    * Fixed child elements of the element returned by SimpleXMLElement::addChild() not being accessible by     property name when namespaces are involved. (Ilia Alshanetsky)

    **SAPI:**

    * Fixed fuzzer targets failing to build in isolation. (Mrmaxmeier)
    * Fixed returns uninitialized value on LiteSpeed lsapi SAPI (Go Kudo)

    ----

    Update to podofo-1.1.2.

    ----

    Backport fix for CVE-2026-73515.

    ----

    - Update to 6.1.0 for CVE-2026-78123, CVE-2026-78124, CVE-2026-78126, CVE-2026-78127, CVE-2026-78129,     CVE-2026-78130, CVE-2026-78131, CVE-2026-78132, CVE-2026-78133, CVE-2026-78134 and CVE-2026-78135

    ----

    Upstream release, see wiki page below for detailed notes.

    ----

    Update to twinkle-1.11.0.

    ----

    VLC 3.0.24: https://code.videolan.org/videolan/vlc/-/tags/3.0.24

    * Switch GUI to Qt6
    * Re-enable AS-DCP plugin
    * Disable RDP plugin
    * Disable Real RTSP plugin



    ----

    7.4.15







Tenable has extracted the preceding description block directly from the Fedora 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.

  - A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can     trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element     lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of     Service (DoS). (CVE-2026-76781)

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

ID	Name	Product	Family	Type	Severity
365375	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : libxml2 vulnerabilities (USN-8910-1)	Nessus	Ubuntu Local Security Checks	Local	high
459781	Echo: libxml2: security update to 2.12.7+dfsg+really2.9.14-2.1+deb13u3+e3libxml2-2.11.7: security update to 2.11.7+e1libxml2-2.15.3: security update to 2.15.3+e1libxml2-2.9.1: security update to 2.9.1+e1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
459781	Echo: libxml2: security update to 2.12.7+dfsg+really2.9.14-2.1+deb13u3+e3libxml2-2.11.7: security update to 2.11.7+e1libxml2-2.15.3: security update to 2.15.3+e1libxml2-2.9.1: security update to 2.9.1+e1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
362719	Fedora 45 : 0ad / GAPDoc / GConf2 / GraphicsMagick / ImageMagick / Io-language / etc (2026-91259c13b9)	Nessus	Fedora Local Security Checks	Local	high
346955	Linux Distros Unpatched Vulnerability : CVE-2026-76781	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-76781

medium

Tenable Plugins

high

medium

medium

high

medium