Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like "/00" and "/01" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8453-1 advisory.

    It was discovered that Net::CIDR::Lite incorrectly validated IP address and CIDR mask inputs. An attacker     could possibly use this issue to bypass IP access control lists. (CVE-2026-45190)

    It was discovered that Net::CIDR::Lite incorrectly handled extraneous zero characters in CIDR mask values.
    An attacker could possibly use this issue to bypass IP access control lists. (CVE-2026-45191)

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 remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2113-1 advisory.

    This update for perl-Net-CIDR-Lite fixes the following issues

    - CVE-2026-45190: improper validation of trailing newlines or non-ASCII digits can lead to IP ACL bypass     (bsc#1264710).
    - CVE-2026-45191: extraneous leading zeros in CIDR mask values can lead to IP ACL bypass (bsc#1264709).
    - CVE-2026-40198: missing validation for the IPv6 group count can lead to IP ACL bypass (bsc#1262088).
    - CVE-2026-40199: mishandled IPv4 mapped IPv6 addresses can lead to IP ACL bypass (bsc#1262088).

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

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1732 advisory.

    Net::CIDR::Lite versions before 0.24 for Perl does not properly validate IP address and CIDR mask inputs,     which may allow IP ACL bypass.

    Inputs containing a trailing newline or non-ASCII digit characters pass the validators but are then re-     encoded by the parser to a different address than the input string spelled. find() and bin_find() can     match or miss addresses as a result.

    Example:

    my $cidr = Net::CIDR::Lite->new();$cidr->add(::1\n/128);$cidr->find(::1a);  # incorrectly returns true

    See also CVE-2026-45191. (CVE-2026-45190)

    Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in     CIDR mask values, which may allow IP ACL bypass.

    Mask forms like /00 and /01 pass validation and parse to the same prefix as their unpadded value.

    See also CVE-2026-45190. (CVE-2026-45191)

Tenable has extracted the preceding description block directly from the tested product 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 multiple vulnerabilities as referenced in the FEDORA-2026-9e783d6aa1 advisory.

    This update addresses some input validation issues:

     * Reject Unicode digits and trailing newlines in parser inputs (CVE-2026-45190)
     * Reject zero-padded CIDR masks (CVE-2026-45191)


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 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-6f3d2d0d82 advisory.

    This update addresses some input validation issues:

     * Reject Unicode digits and trailing newlines in parser inputs (CVE-2026-45190)
     * Reject zero-padded CIDR masks (CVE-2026-45191)


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.

  - Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in     CIDR mask values, which may allow IP ACL bypass. Mask forms like /00 and /01 pass validation and parse     to the same prefix as their unpadded value. See also CVE-2026-45190. (CVE-2026-45191)

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

ID	Name	Product	Family	Severity
321766	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Net::CIDR::Lite vulnerabilities (USN-8453-1)	Nessus	Ubuntu Local Security Checks	medium
319663	SUSE SLED15 / SLES15 Security Update : perl-Net-CIDR-Lite (SUSE-SU-2026:2113-1)	Nessus	SuSE Local Security Checks	high
316830	Amazon Linux 2023 : perl-Net-CIDR-Lite (ALAS2023-2026-1732)	Nessus	Amazon Linux Local Security Checks	medium
315369	Fedora 43 : perl-Net-CIDR-Lite (2026-9e783d6aa1)	Nessus	Fedora Local Security Checks	medium
314986	Fedora 44 : perl-Net-CIDR-Lite (2026-6f3d2d0d82)	Nessus	Fedora Local Security Checks	medium
314153	Linux Distros Unpatched Vulnerability : CVE-2026-45191	Nessus	Misc.	medium

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