The version of PHP installed on the remote host is prior to 8.5.6. It is, therefore, affected by multiple vulnerabilities as referenced in the Version 8.5.6 advisory.

  - uriparser before 1.0.1 has numeric truncation in text range comparison, if an application accepts URIs     with a length in gigabytes. (CVE-2026-42371)

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

The version of PHP installed on the remote host is prior to 8.4.21. It is, therefore, affected by multiple vulnerabilities as referenced in the Version 8.4.21 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 Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6256 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6256-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     May 08, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : php8.4     CVE ID         : CVE-2025-14179 CVE-2026-6104 CVE-2026-6722 CVE-2026-6735                      CVE-2026-7258 CVE-2026-7259 CVE-2026-7261 CVE-2026-7262                      CVE-2026-7263 CVE-2026-7568

    Multiple security issues were found in PHP, a widely-used open source     general purpose scripting language which could result in denial of     service, SQL injection, cross-site scripting, information disclosure     or the execution of arbitrary code.

    For the stable distribution (trixie), these problems have been fixed in     version 8.4.21-1~deb13u1.

    We recommend that you upgrade your php8.4 packages.

    For the detailed security status of php8.4 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/php8.4

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

    Mailing list: debian-security-announce@lists.debian.org

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.

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

  - In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding name containing an embedded     NUL byte is passed to mb_convert_encoding() or related mbstring functions, the code incorrectly assumes     that when strncasecmp() returns 0 it means the strings have the same length. This can lead to out-of-     bounds read of global memory, potentially causing a crash or information disclosure or crash. Affected     functions include mb_convert_encoding(), mb_detect_encoding(), mb_convert_variables(), and     mb_detect_order(), as well as the mbstring.detect_order and mbstring.http_output INI settings.
    (CVE-2026-6104)

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

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-c66eaae759 advisory.

    **PHP version 8.5.6** (07 May 2026)

    **Core:**

    * Fixed bug [GH-19983](https://github.com/php/php-src/issues/19983) (GC assertion failure with fibers,     generators and destructors). (iliaal)
    * Fixed ZEND_API mismatch on zend_ce_closure forward decl for Windows+Clang. (henderkes)
    * Fixed bug [GH-21504](https://github.com/php/php-src/issues/21504) (Incorrect RC-handling for     ZEND_EXT_STMT op1). (ilutov)
    * Fixed bug [GH-21478](https://github.com/php/php-src/issues/21478) (Forward property operations to real     instance for initialized lazy proxies). (iliaal)
    * Fixed bug [GH-21605](https://github.com/php/php-src/issues/21605) (Missing addref for     Countable::count()). (ilutov)
    * Fixed bug [GH-21699](https://github.com/php/php-src/issues/21699) (Assertion failure in     shutdown_executor when resolving self::/parent::/static:: callables if the error handler throws).
    (macoaure)
    * Fixed bug [GH-21603](https://github.com/php/php-src/issues/21603) (Missing addref for __unset). (ilutov)
    * Fixed bug [GH-21760](https://github.com/php/php-src/issues/21760) (Trait with class constant name     conflict against enum case causes SEGV). (Pratik Bhujel)

    **CLI:**

    * Fixed bug [GH-21754](https://github.com/php/php-src/issues/21754) (`--rf` command line option with a     method triggers ext/reflection deprecation warnings). (DanielEScherzer)

    **Curl:**

    * Add support for brotli and zstd on Windows. (Shivam Mathur)

    **DOM:**

    * Fixed [GHSA-4jhr-8w89-j733](https://github.com/php/php-src/security/advisories/GHSA-4jhr-8w89-j733) and     [GH-21566](https://github.com/php/php-src/issues/21566) (Dom\XMLDocument::C14N() emits duplicate xmlns     declarations after setAttributeNS()). (**CVE-2026-7263**) (David Carlier)

    **FPM:**

    * Fixed [GHSA-7qg2-v9fj-4mwv](https://github.com/php/php-src/security/advisories/GHSA-7qg2-v9fj-4mwv) (XSS     within status endpoint). (**CVE-2026-6735**) (Jakub Zelenka)

    **Iconv:**

    * Fixed bug [GH-17399](https://github.com/php/php-src/issues/17399) (iconv memory leak on bailout).
    (iliaal)

    **Lexbor:**

    * Upgrade to lexbor v2.7.0. (**CVE-2026-29078**, **CVE-2026-29079**) (ndossche, ilutov)

    **MBString:**

    * Fixed [GHSA-wm6j-2649-pv75](https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75)     (Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()). (**CVE-2026-7259**)     (vi3tL0u1s)
    * Fixed [GHSA-74r9-qxhc-fx53](https://github.com/php/php-src/security/advisories/GHSA-74r9-qxhc-fx53)     (Out-of-bounds access in mbfl_name2encoding_ex()). (**CVE-2026-6104**) (ilutov)

    **Opcache:**

    * Fixed bug [GH-21158](https://github.com/php/php-src/issues/21158) (JIT: Assertion jit->ra[var].flags &     (1<<0) failed in zend_jit_use_reg). (Arnaud)
    * Fixed bug [GH-21593](https://github.com/php/php-src/issues/21593) (Borked function JIT JMPNZ smart     branch). (ilutov)
    * Fixed bug [GH-21460](https://github.com/php/php-src/issues/21460) (COND optimization regression).
    (Dmitry, Arnaud)
    * Fixed faulty returns out of zend_try block in zend_jit_trace(). (ilutov)

    **OpenSSL:**

    * Fix memory leak regression in openssl_pbkdf2(). (ndossche)
    * Fix a bunch of memory leaks and crashes on edge cases. (ndossche)

    **PDO_Firebird:**

    * Fixed [GHSA-w476-322c-wpvm](https://github.com/php/php-src/security/advisories/GHSA-w476-322c-wpvm) (SQL     injection via NUL bytes in quoted strings). (**CVE-2025-14179**) (SakiTakamachi)

    **PDO_PGSQL:**

    * Fixed bug [GH-21683](https://github.com/php/php-src/issues/21683) (pdo_pgsql throws with ATTR_PREFETCH=0     on empty result set). (thomasschiet)

    **Phar:**

    * Restore is_link handler in phar_intercept_functions_shutdown. (iliaal)
    * Fixed bug [GH-21797](https://github.com/php/php-src/issues/21797) (phar: NULL dereference in     Phar::webPhar() when SCRIPT_NAME is absent from SAPI environment). (iliaal)
    * Fix memory leak in Phar::offsetGet(). (iliaal)
    * Fix memory leak in phar_add_file(). (iliaal)
    * Fixed bug [GH-21799](https://github.com/php/php-src/issues/21799) (phar: propagate phar_stream_flush     return value from phar_stream_close). (iliaal)
    * Fix memory leak in phar_verify_signature() when md_ctx is invalid. (JarneClauw)

    **Random:**

    * Fixed bug [GH-21731](https://github.com/php/php-src/issues/21731)     (Random\Engine\Xoshiro256StarStar::__unserialize() accepts all-zero state). (iliaal)

    **Session:**

    * Fixed memory leak when session GC callback return a refcounted value. (jorgsowa)

    **SOAP:**

    * Fixed [GHSA-85c2-q967-79q5](https://github.com/php/php-src/security/advisories/GHSA-85c2-q967-79q5)     (Stale SOAP_GLOBAL(ref_map) pointer with Apache Map). (**CVE-2026-6722**) (ilutov)
    * Fixed [GHSA-m33r-qmcv-p97q](https://github.com/php/php-src/security/advisories/GHSA-m33r-qmcv-p97q)     (Use-after-free after header parsing failure with SOAP_PERSISTENCE_SESSION). (**CVE-2026-7261**) (ilutov)
    * Fixed [GHSA-hmxp-6pc4-f3vv](https://github.com/php/php-src/security/advisories/GHSA-hmxp-6pc4-f3vv)     (Broken Apache map value NULL check). (**CVE-2026-7262**) (ilutov)

    **SPL:**

    * Fixed bug [GH-21499](https://github.com/php/php-src/issues/21499) (RecursiveArrayIterator getChildren     UAF after parent free). (Girgias)
    * Fix concurrent iteration and deletion issues in SplObjectStorage. (ndossche)

    **Sqlite3:**

    * Fixed wrong free list comparator pointer type. (David Carlier)

    **Standard:**

    * Fixed [GHSA-96wq-48vp-hh57](https://github.com/php/php-src/security/advisories/GHSA-96wq-48vp-hh57)     (Signed integer overflow of char array offset). (**CVE-2026-7568**) (TimWolla)
    * Fixed [GHSA-m8rr-4c36-8gq4](https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4)     (Consistently pass unsigned char to ctype.h functions). (**CVE-2026-7258**) (ilutov)

    **Streams:**

    * Fixed bug [GH-21468](https://github.com/php/php-src/issues/21468) (Segfault in file_get_contents w/ a     https URL and a proxy set). (ndossche)


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.

ID	Name	Product	Family	Published	Updated	Severity
313112	PHP 8.5.x < 8.5.6 Multiple Vulnerabilities	Nessus	CGI abuses	5/7/2026	5/11/2026	critical
313115	PHP 8.4.x < 8.4.21 Multiple Vulnerabilities	Nessus	CGI abuses	5/7/2026	5/11/2026	critical
313417	Debian dsa-6256 : libapache2-mod-php8.4 - security update	Nessus	Debian Local Security Checks	5/8/2026	5/11/2026	critical
313254	Linux Distros Unpatched Vulnerability : CVE-2026-6104	Nessus	Misc.	5/8/2026	5/11/2026	medium
313734	Fedora 44 : php (2026-c66eaae759)	Nessus	Fedora Local Security Checks	5/10/2026	5/10/2026	critical

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