phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 9647af6d-7a05-11f1-99fc-40b034429ecf advisory.

    Cacti project reports:
    This release includes fixes for a number of vulnerabilities that were responsibly disclosed by external     researchers

Tenable has extracted the preceding description block directly from the FreeBSD 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 Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4670 advisory.

    - -----------------------------------------------------------------------     Debian LTS Advisory DLA-4670-1              debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Utkarsh Gupta     July 05, 2026                               https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------

    Package        : php-phpseclib     Version        : 2.0.30-2+deb11u3     CVE ID         : CVE-2023-52892 CVE-2026-32935 CVE-2026-40194                      CVE-2026-44167 CVE-2026-55599     Debian Bug     : 1131483

    Several vulnerabilities were discovered in phpseclib, a PHP secure     communications library, which could result in hostname validation     bypass, timing side-channel attacks, denial of service, and     server-side request forgery (SSRF).

    CVE-2023-52892

        X509.php did not properly escape regular expression special         characters in a certificate's subjectAltName, allowing a crafted         certificate to bypass hostname validation in validateURL().

    CVE-2026-32935

        The block cipher unpadding routine in Crypt/Base.php used a         short-circuiting comparison, creating a timing side channel that         could aid padding-oracle-style attacks.

    CVE-2026-40194

        The SSH2 implementation compared incoming packet HMACs using a         variable-time string comparison, creating a timing side channel         on cryptographic material.

    CVE-2026-44167

        The ASN.1 decoder's 4096-byte Object Identifier limit (mitigating         CVE-2024-27355) was still large enough to allow an OID         amplification denial of service via crafted ASN.1 structures.

    CVE-2026-55599

        File_X509 could automatically fetch a URL from a certificate's         Authority Information Access extension without validating the         destination, allowing SSRF via a crafted certificate.

    For Debian 11 bullseye, these problems have been fixed in version     2.0.30-2+deb11u3.

    We recommend that you upgrade your php-phpseclib packages.

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

    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.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ca43aa006f advisory.

    33.0.1 release

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 remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4518 advisory.

    - -----------------------------------------------------------------------     Debian LTS Advisory DLA-4518-1              debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Utkarsh Gupta     March 30, 2026                              https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------

    Package        : phpseclib     Version        : 1.0.19-3+deb11u3     CVE ID         : CVE-2023-52892 CVE-2026-32935

    Two vulnerabilities were discovered in phpseclib, a PHP Secure     Communications Library.

    CVE-2023-52892

        Some characters in Subject Alternative Name fields in TLS         certificates were incorrectly allowed to have a special meaning         in regular expressions, leading to name confusion in X.509         certificate host verification.

    CVE-2026-32935

        The AES-CBC implementation was susceptible to a padding oracle         timing attack due to the use of a short-circuiting logical         operator in the unpadding function.

    For Debian 11 bullseye, these problems have been fixed in version     1.0.19-3+deb11u3.

    We recommend that you upgrade your phpseclib packages.

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

    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.

The remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-65fdd15133 advisory.

    Update to v3.0.50; contains fix for CVE-2026-32935

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

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

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-b7d9416ec4 advisory.

    Update to v3.0.50; contains fix for CVE-2026-32935

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

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

The remote Debian 12 / 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6185 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6185-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     March 29, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : phpseclib     CVE ID         : CVE-2026-32935

    It was discovered that the AES-CBC implementation in the PHP Secure     Communications Library was susceptible to a padding oracle timing attack.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 1.0.20-1+deb12u3. This update also fixes CVE-2023-52892.

    For the stable distribution (trixie), these problems have been fixed in     version 1.0.23-6+deb13u1.

    We recommend that you upgrade your phpseclib packages.

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

    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 remote Debian 12 / 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6186 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6186-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     March 29, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : php-phpseclib     CVE ID         : CVE-2026-32935

    It was discovered that the AES-CBC implementation in the PHP Secure     Communications Library was susceptible to a padding oracle timing attack.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 2.0.42-1+deb12u3. This update also fixes CVE-2023-52892.

    For the stable distribution (trixie), these problems have been fixed in     version 2.0.48-3+deb13u1.

    We recommend that you upgrade your php-phpseclib packages.

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

    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 remote Debian 12 / 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6187 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6187-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     March 29, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : php-phpseclib3     CVE ID         : CVE-2026-32935

    It was discovered that the AES-CBC implementation in the PHP Secure     Communications Library was susceptible to a padding oracle timing attack.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 3.0.19-1+deb12u4. This update also fixes CVE-2023-52892.

    For the stable distribution (trixie), these problems have been fixed in     version 3.0.43-2+deb13u1.

    We recommend that you upgrade your php-phpseclib3 packages.

    For the detailed security status of php-phpseclib3 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/php-phpseclib3

    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 remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-d1feefa819 advisory.

    Update to v2.0.52


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

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

The remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-bfeb46516b advisory.

    Update to v2.0.52


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

Note that Nessus has not tested for this issue 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:

  - phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0
    through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using
    AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50. (CVE-2026-32935)

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

  - phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0     through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using     AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50. (CVE-2026-32935)

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

ID	Name	Product	Family	Severity
325775	FreeBSD : cacti -- multiple vulnerabilities (9647af6d-7a05-11f1-99fc-40b034429ecf)	Nessus	FreeBSD Local Security Checks	critical
325133	Debian dla-4670 : php-phpseclib - security update	Nessus	Debian Local Security Checks	high
305115	Fedora 42 : nextcloud (2026-ca43aa006f)	Nessus	Fedora Local Security Checks	high
304326	Debian dla-4518 : php-seclib - security update	Nessus	Debian Local Security Checks	high
304313	Fedora 42 : php-phpseclib3 (2026-65fdd15133)	Nessus	Fedora Local Security Checks	high
304261	Fedora 43 : php-phpseclib3 (2026-b7d9416ec4)	Nessus	Fedora Local Security Checks	high
304247	Debian dsa-6185 : php-seclib - security update	Nessus	Debian Local Security Checks	high
304246	Debian dsa-6186 : php-phpseclib - security update	Nessus	Debian Local Security Checks	high
304245	Debian dsa-6187 : php-phpseclib3 - security update	Nessus	Debian Local Security Checks	high
304039	Fedora 43 : php-phpseclib (2026-d1feefa819)	Nessus	Fedora Local Security Checks	high
304027	Fedora 42 : php-phpseclib (2026-bfeb46516b)	Nessus	Fedora Local Security Checks	high
439095	SCA: security update for phpseclib/phpseclib (GHSA-94g3-g5v7-q4jg)	Tenable Cloud Security	SCA Checks	high
439095	SCA: security update for phpseclib/phpseclib (GHSA-94g3-g5v7-q4jg)	Tenable Self-Hosted Container Security	SCA Checks	high
303271	Linux Distros Unpatched Vulnerability : CVE-2026-32935	Nessus	Misc.	high

Detections

Analytics

CVE-2026-32935

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Tenable Plugins

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