CPAN 2.28 allows Signature Verification Bypass.

The CentOS Linux 8.4 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.4:CLSA-2025:1758821935 advisory.

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

  - CPAN.pm before 2.35 does not verify TLS certificates when downloading distributions over HTTPS.
    (CVE-2023-31484)

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

The CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS- STREAM8:CLSA-2025:1758822139 advisory.

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

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

The CentOS Linux 8 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS- STREAM8:CLSA-2025:1750165585 advisory.

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

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

The Rocky Linux 8 host has a package installed that is affected by a vulnerability as referenced in the CIQ crlsa-2025_8432 advisory.

    * perl-CPAN: Bypass of verification of signatures in CHECKSUMS files (CVE-2020-16156)

Tenable has extracted the preceding description block directly from the CIQ 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 CentOS Linux 8.5 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.5:CLSA-2025:1758822697 advisory.

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

  - CPAN.pm before 2.35 does not verify TLS certificates when downloading distributions over HTTPS.
    (CVE-2023-31484)

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 Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2025:0420 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2020-16156:
    A flaw was found in the way the perl-CPAN performed verification of package signatures stored in CHECKSUMS     files. A malicious or compromised CPAN server used by a user, or a man-in-the-middle attacker, could use     this flaw to bypass signature verification.

Tenable has extracted the preceding description block directly from the Tencent Linux 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 MiracleLinux 8 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2025-9982:02 advisory.

    * perl-CPAN: Bypass of verification of signatures in CHECKSUMS files (CVE-2020-16156)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 Oracle Linux 8 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2025-8432 advisory.

    [2.18-402]
    - Resolves: RHEL-9605
      - Add 2022 PAUSE public key.
      - Change default value for urllist to https://www.cpan.org
      - Use gpg --verify --output ... to disentangle data and signature

Tenable has extracted the preceding description block directly from the Oracle Linux 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 AlmaLinux 8 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2025:8432 advisory.

    * perl-CPAN: Bypass of verification of signatures in CHECKSUMS files (CVE-2020-16156)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 Redhat Enterprise Linux 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2025:8432 advisory.

    The CPAN module is a tool to query, download and build perl modules from CPAN sites.

    Security Fix(es):

    * perl-CPAN: Bypass of verification of signatures in CHECKSUMS files (CVE-2020-16156)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

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

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3926 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3926-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     October 21, 2024                              https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : perl     Version        : 5.32.1-4+deb11u4     CVE ID         : CVE-2020-16156 CVE-2023-31484     Debian Bug     : 1015985 1035109

    Vulnerabilities were found in Perl's CPAN.pm, which could lead CPAN     clients to install malicious modules.

    CVE-2020-16156

        Stig Palmquist discovered that an attacker can prepend checksums for         modified packages to the beginning of CHECKSUMS files, before the         cleartext PGP headers, resulting in signature verification bypass.

        CPAN.pm has been updated so that when configured to validate the         signature on CHECKSUMS, it will refuse to install a tarball if the         associated CHECKSUMS file isn't signed.  The gpg(1) executable is         required in order to validate signatures.

    CVE-2023-31484

        Stig Palmquist discovered that CPAN::HTTP::Client did not verify         X.509 certificates in the HTTP::Tiny call, which could allows an         attacker to MITM the connection with the CPAN mirror.

        CPAN::HTTP::Client now enables the `verify_SSL` flag.  HTTPS mirrors         therefore require a valid certificate.  The identity of the default         mirror https://cpan.org can be verified after installing the         'ca-certificates' package.

    For Debian 11 bullseye, these problems have been fixed in version     5.32.1-4+deb11u4.

    We recommend that you upgrade your perl packages.

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

    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     Attachment:
    signature.asc     Description: PGP signature

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.

According to the versions of the perl packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the perl packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 22.10 host has packages installed that are affected by a vulnerability as referenced in the USN-5689-2 advisory.

    USN-5689-1 fixed a vulnerability in Perl. This update provides the corresponding update for Ubuntu 22.10.



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

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

It is, therefore, affected by a vulnerability as referenced in the ALAS2022-2022-161 advisory.

    A flaw was found in the way the perl-CPAN performed verification of package signatures stored in CHECKSUMS     files. A malicious or compromised CPAN server used by a user, or a man-in-the-middle attacker, could use     this flaw to bypass signature verification. (CVE-2020-16156)

Tenable has extracted the preceding description block directly from the tested product 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 Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS / 22.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-5689-1 advisory.

    It was discovered that Perl incorrectly handled certain signature verification. An remote attacker could     possibly use this issue to bypass signature verification.

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

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

According to the versions of the perl-CPAN package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It is, therefore, affected by a vulnerability as referenced in the ALAS2022-2022-072 advisory.

    A flaw was found in the way the perl-CPAN performed verification of package signatures stored in CHECKSUMS     files. A malicious or compromised CPAN server used by a user, or a man-in-the-middle attacker, could use     this flaw to bypass signature verification. (CVE-2020-16156)

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

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

According to the versions of the perl-CPAN package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - CPAN 2.28 allows Signature Verification Bypass. (CVE-2020-16156)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Type	Severity
361437	CentOS Linux 8.4 [TuxCare] Security Update: perl-CPAN Multiple Vulnerabilities (CENTOS8.4:CLSA-2025:1758821935)	Nessus	CentOS Local Security Checks	Local	high
361236	CentOS Linux 8 [TuxCare] Security Update: perl-CPAN / perl-CPAN-tests (CENTOS-STREAM8:CLSA-2025:1758822139)	Nessus	CentOS Local Security Checks	Local	high
360640	CentOS Linux 8 [TuxCare] Security Update: perl-ExtUtils-Embed / perl-IO-Zlib / perl-Locale-Maketext-Simple / etc (CENTOS-STREAM8:CLSA-2025:1750165585)	Nessus	CentOS Local Security Checks	Local	high
353584	Rocky Linux 8 [CIQ] Security Update: perl-CPAN (crlsa-2025_8432)	Nessus	Rocky Linux Local Security Checks	Local	high
353021	CentOS Linux 8.5 [TuxCare] Security Update: perl-CPAN Multiple Vulnerabilities (CENTOS8.5:CLSA-2025:1758822697)	Nessus	CentOS Local Security Checks	Local	high
325294	TencentOS Server 3: perl-CPAN (TSSA-2025:0420)	Nessus	Tencent Local Security Checks	Local	high
282852	MiracleLinux 8 : perl-CPAN-2.18-402.el8_10 (AXSA:2025-9982:02)	Nessus	Miracle Linux Local Security Checks	Local	high
237745	Oracle Linux 8 : perl-CPAN (ELSA-2025-8432)	Nessus	Oracle Linux Local Security Checks	Local	high
237723	AlmaLinux 8 : perl-CPAN (ALSA-2025:8432)	Nessus	Alma Linux Local Security Checks	Local	high
237704	RHEL 8 : perl-CPAN (RHSA-2025:8432)	Nessus	Red Hat Local Security Checks	Local	high
223452	Linux Distros Unpatched Vulnerability : CVE-2020-16156	Nessus	Misc.	Local	high
209443	Debian dla-3926 : libperl-dev - security update	Nessus	Debian Local Security Checks	Local	high
178891	EulerOS Virtualization 3.0.6.6 : perl (EulerOS-SA-2023-2432)	Nessus	Huawei Local Security Checks	Local	high
177038	EulerOS 2.0 SP5 : perl (EulerOS-SA-2023-2163)	Nessus	Huawei Local Security Checks	Local	high
168231	Ubuntu 22.10 : Perl vulnerability (USN-5689-2)	Nessus	Ubuntu Local Security Checks	Local	high
167011	Amazon Linux 2022 : perl-CPAN, perl-CPAN-tests (ALAS2022-2022-161)	Nessus	Amazon Linux Local Security Checks	Local	high
166266	Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS / 22.04 LTS : Perl vulnerability (USN-5689-1)	Nessus	Ubuntu Local Security Checks	Local	high
165973	EulerOS Virtualization 3.0.6.0 : perl-CPAN (EulerOS-SA-2022-2581)	Nessus	Huawei Local Security Checks	Local	high
164700	Amazon Linux 2022 : perl-CPAN, perl-CPAN-tests (ALAS2022-2022-072)	Nessus	Amazon Linux Local Security Checks	Local	high
159244	EulerOS 2.0 SP8 : perl-CPAN (EulerOS-SA-2022-1358)	Nessus	Huawei Local Security Checks	Local	high

Detections

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CVE-2020-16156

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Tenable Plugins

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