MediumFix available

libcrypt-argon2-perl — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2026-8463

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.

Products: libcrypt-argon2-perl
Affected versions: 0.013-1, 0.020-1, 0.022-1, 0.026-1, 0.029-1, 0.030-1, 0.031-1, 0.032-1
Fixed versions: 0.031-1
CVEs: CVE-2026-8463
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 17:39 UTC · Revision 2

Source evidence

DEBIAN-CVE-2026-8463

core-osv · Original source

Published 13 May 2026, 14:18 UTC

osv:DEBIAN-CVE-2026-8463

libcrypt-argon2-perl

Fixed versions: Not specified

libcrypt-argon2-perl

Fixed versions: Not specified

libcrypt-argon2-perl

Fixed versions: 0.031-1

Complete source record

{
  "id": "da82d09ff45539ac69441c4ba1400732b011da8e3c90af68f99f23b6ff33643f",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-8463",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-8463",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2026-8463",
    "products": [
      {
        "name": {
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          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
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            "value": "0.013-1",
            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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          {
            "value": "0.022-1",
            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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          {
            "value": "0.029-1",
            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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            "evidence": "/affected/0/versions"
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        "affected_versions": [
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    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-8463",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
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      "affected": [
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            "purl": "pkg:deb/debian/libcrypt-argon2-perl?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
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          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-8463.json"
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          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
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              "events": [
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          "package": {
            "name": "libcrypt-argon2-perl",
            "purl": "pkg:deb/debian/libcrypt-argon2-perl?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
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          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-8463.json"
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        {
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          "package": {
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          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-27T09:47:32.726929058Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-8463"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-8463"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-8463",
        "evidence": "/upstream"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 460964,
  "published_at": "2026-05-13T14:18:17.14+00:00"
}