Crypt::Argon2 versions from 0.017 before 0.031 for Perl perform a heap out-of-bounds read in argon2_verify on empty encoded input. The auto-detect form of argon2_verify passes encoded_len - 1 as the length argument to memchr without checking that encoded_len is non-zero. When the encoded string is empty, the size_t subtraction underflows to SIZE_MAX and memchr scans adjacent heap memory looking for a '$' separator byte. A caller that invokes argon2_verify against a stored hash that may legitimately be empty (for example a placeholder row or a NULL column materialised as an empty string) reads out-of-bounds heap memory, which can crash the process or leak the position of an adjacent '$' byte into subsequent parsing.

The remote Fedora 43 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2026-f2c746ff8e advisory.

    Update to 0.031 #2477035 #2481131 fixes CVE-2026-8463

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 44 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2026-dafdad8fd3 advisory.

    Update to 0.031 #2477035 #2481131 fixes CVE-2026-8463

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 45 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2026-5d15cef372 advisory.

    Update perl-Crypt-Argon2 to 0.031 #2477035 #2481131 fixes CVE-2026-8463

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

  - Crypt::Argon2 versions from 0.017 before 0.031 for Perl perform a heap out-of-bounds read in argon2_verify     on empty encoded input. The auto-detect form of argon2_verify passes encoded_len - 1 as the length     argument to memchr without checking that encoded_len is non-zero. When the encoded string is empty, the     size_t subtraction underflows to SIZE_MAX and memchr scans adjacent heap memory looking for a '$'     separator byte. A caller that invokes argon2_verify against a stored hash that may legitimately be empty     (for example a placeholder row or a NULL column materialised as an empty string) reads out-of-bounds heap     memory, which can crash the process or leak the position of an adjacent '$' byte into subsequent parsing.
    (CVE-2026-8463)

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

ID	Name	Product	Family	Severity
318772	Fedora 43 : perl-Crypt-Argon2 / perl-Dist-Build / perl-ExtUtils-Builder / etc (2026-f2c746ff8e)	Nessus	Fedora Local Security Checks	medium
318760	Fedora 44 : perl-Crypt-Argon2 / perl-Dist-Build / perl-ExtUtils-Builder / etc (2026-dafdad8fd3)	Nessus	Fedora Local Security Checks	medium
317051	Fedora 45 : perl-Crypt-Argon2 / perl-Dist-Build / perl-ExtUtils-Builder / etc (2026-5d15cef372)	Nessus	Fedora Local Security Checks	medium
314483	Linux Distros Unpatched Vulnerability : CVE-2026-8463	Nessus	Misc.	medium

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CVE-2026-8463

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