{
  "cveId": "CVE-2026-13713",
  "url": "https://patchblox.com/security/cve/CVE-2026-13713",
  "summary": "CVE-2026-13713 is fixed in 5 products on 1 platform, first by FEDORA-2026-C8484F1AFB, released July 14, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "libyaml-syck-perl: YAML::Syck versions before 1.47 for Perl allow a use-after-free and double-free via an anchor node freed while still...",
  "description": "YAML::Syck versions before 1.47 for Perl allow a use-after-free and double-free via an anchor node freed while still on the parser value stack.  In the bundled libsyck, when an anchor name is redefined or removed, syck_hdlr_add_anchor and syck_hdlr_remove_anchor free the node stored under that name with syck_free_node. That node can still be live on the parser\u0027s value stack, so syck_hdlr_add_node reaches it again and frees it a second time. On a normal build the 48-byte node chunk is freed twice and the interpreter aborts. Anchors need no special flags, so this is reached on the default Load path, and a 7-byte document that redefines an anchor triggers it.  Any caller that runs Load or LoadFile on an untrusted document that redefines an anchor mid-parse crashes the interpreter, a denial of service.",
  "published": "2026-07-14T10:28:10Z",
  "severity": "medium",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00179,
  "epssPercentile": 0.0747,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libyaml-syck-perl",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.34-2\u002Bdeb12u3",
      "fix": "DEBIAN-CVE-2026-13713",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-13713",
      "released": "2026-07-19T12:50:38Z"
    },
    {
      "platform": "linux",
      "product": "libyaml-syck-perl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.34-2\u002Bdeb13u3",
      "fix": "DEBIAN-CVE-2026-13713",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-13713",
      "released": "2026-07-19T12:50:38Z"
    },
    {
      "platform": "linux",
      "product": "libyaml-syck-perl",
      "release": "Debian 14",
      "fixedVersion": "1.47-1",
      "fix": "DEBIAN-CVE-2026-13713",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-13713",
      "released": "2026-07-19T12:50:38Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck",
      "release": "Fedora 43",
      "fixedVersion": "1.47-1.fc43",
      "fix": "FEDORA-2026-C8484F1AFB",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-c8484f1afb",
      "released": "2026-07-14T10:28:10Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck",
      "release": "RHEL 8",
      "fixedVersion": "0:1.30-7.el8_10",
      "fix": "RHSA-2026:67269",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-67269",
      "released": "2026-09-19T18:31:30Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck",
      "release": "almalinux 8",
      "fixedVersion": "1.30-7.el8_10",
      "fix": "ALSA-2026:67269",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-67269",
      "released": "2026-09-14T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck",
      "release": "amzn 2023",
      "fixedVersion": "1.37-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-2007",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2007",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck",
      "release": "ol 8",
      "fixedVersion": "0:1.30-7.el8_10",
      "fix": "ELSA-2026-67269-0",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-67269-0",
      "released": "2026-09-14T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.470.0-bp160.1.1",
      "fix": "OPENSUSE-SU-2026:21497-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21497-1",
      "released": "2026-07-29T09:24:06Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck",
      "release": "rocky 8",
      "fixedVersion": "0:1.30-7.el8_10",
      "fix": "RLSA-2026:67269",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-67269",
      "released": "2026-09-15T06:02:28Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "1.47-1.fc43",
      "fix": "FEDORA-2026-C8484F1AFB",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-c8484f1afb",
      "released": "2026-07-14T10:28:10Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.37-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-2007",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2007",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck-debugsource",
      "release": "Fedora 43",
      "fixedVersion": "1.47-1.fc43",
      "fix": "FEDORA-2026-C8484F1AFB",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-c8484f1afb",
      "released": "2026-07-14T10:28:10Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1.37-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-2007",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2007",
      "released": "2026-08-03T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "perl-YAML-Syck-tests",
      "release": "amzn 2023",
      "fixedVersion": "1.37-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-2007",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2007",
      "released": "2026-08-03T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}