In phpseclib before 1.0.22, 2.x before 2.0.46, and 3.x before 3.0.33, some characters in Subject Alternative Name fields in TLS certificates are incorrectly allowed to have a special meaning in regular expressions (such as a + wildcard), leading to name confusion in X.509 certificate host verification.

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 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 Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7404-1 advisory.

    It was discovered that phpseclib did not correctly handle RSA PKCS#1 v1.5 signature verification. An     attacker could possibly use this issue to bypass authentication. This issue only affected Ubuntu 20.04     LTS. (CVE-2021-30130)

    It was discovered that phpseclib did not correctly handle certain characters in certain TLS fields, which     could lead to name confusion. An attacker could possibly use this issue to bypass authentication.
    (CVE-2023-52892)

    It was discovered that phpseclib incorrectly limited the size of prime numbers generated by isPrime. An     attacker could possibly use this issue to cause a denial of service. (CVE-2024-27354)

    It was discovered that phpseclib did not correctly handle processing the ASN.1 object identifier of a     certificate. An attacker could possibly use this issue to cause a denial of service. This issue only     affected Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2024-27355)

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.

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

  - In phpseclib before 1.0.22, 2.x before 2.0.46, and 3.x before 3.0.33, some characters in Subject     Alternative Name fields in TLS certificates are incorrectly allowed to have a special meaning in regular     expressions (such as a + wildcard), leading to name confusion in X.509 certificate host verification.
    (CVE-2023-52892)

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

The remote Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-b38cbff99d advisory.

    Security fix for CVE-2023-52892, CVE-2024-27354

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 Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-91d6e174d9 advisory.

    Security fix for CVE-2023-52892, CVE-2024-27354

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	Severity
304326	Debian dla-4518 : php-seclib - security update	Nessus	Debian 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
233753	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS : phpseclib vulnerabilities (USN-7404-1)	Nessus	Ubuntu Local Security Checks	high
227434	Linux Distros Unpatched Vulnerability : CVE-2023-52892	Nessus	Misc.	high
215157	Fedora 40 : php-phpseclib (2025-b38cbff99d)	Nessus	Fedora Local Security Checks	high
215152	Fedora 41 : php-phpseclib (2025-91d6e174d9)	Nessus	Fedora Local Security Checks	high

Detections

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CVE-2023-52892

high

Tenable Plugins

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high

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high