{"id":"UBUNTU-CVE-2026-8463","details":"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.","modified":"2026-05-20T22:03:08.532534345Z","published":"2026-05-13T14:18:00Z","upstream":["CVE-2026-8463"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-8463"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-8463"},{"type":"REPORT","url":"https://lists.security.metacpan.org/cve-announce/msg/40006926/"},{"type":"REPORT","url":"https://github.com/Leont/crypt-argon2/commit/92eac03ce63d541e0ead7ea5a89b9b67ce0c0e64"}],"affected":[{"package":{"name":"libcrypt-argon2-perl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libcrypt-argon2-perl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.013-1","0.020-1","0.020-1build1","0.020-1build2","0.020-1build3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.020-1build3","binary_name":"libcrypt-argon2-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8463.json"}},{"package":{"name":"libcrypt-argon2-perl","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libcrypt-argon2-perl?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.029-1build1","0.030-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.030-1","binary_name":"libcrypt-argon2-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8463.json"}},{"package":{"name":"libcrypt-argon2-perl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libcrypt-argon2-perl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.030-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.030-1","binary_name":"libcrypt-argon2-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8463.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}