{
  "cveId": "CVE-2026-29013",
  "url": "https://patchblox.com/security/cve/CVE-2026-29013",
  "summary": "CVE-2026-29013 is fixed in 8 products on 1 platform, first by FEDORA-2026-0CE923A09D, released April 17, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "libcoap3: libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc()...",
  "description": "libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with malformed OSCORE options or responses during OSCORE negotiation to trigger out-of-bounds reads during CBOR parsing and potentially cause out-of-bounds reads through integer wraparound in allocation size computation.",
  "published": "2026-04-17T10:02:36Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00296,
  "epssPercentile": 0.22453,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libcoap",
      "release": "Fedora 43",
      "fixedVersion": "4.3.5b-1.fc43",
      "fix": "FEDORA-2026-0CE923A09D",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-0ce923a09d",
      "released": "2026-04-17T10:02:36Z"
    },
    {
      "platform": "linux",
      "product": "libcoap-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "4.3.5b-1.fc43",
      "fix": "FEDORA-2026-0CE923A09D",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-0ce923a09d",
      "released": "2026-04-17T10:02:36Z"
    },
    {
      "platform": "linux",
      "product": "libcoap-debugsource",
      "release": "Fedora 43",
      "fixedVersion": "4.3.5b-1.fc43",
      "fix": "FEDORA-2026-0CE923A09D",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-0ce923a09d",
      "released": "2026-04-17T10:02:36Z"
    },
    {
      "platform": "linux",
      "product": "libcoap-devel",
      "release": "Fedora 43",
      "fixedVersion": "4.3.5b-1.fc43",
      "fix": "FEDORA-2026-0CE923A09D",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-0ce923a09d",
      "released": "2026-04-17T10:02:36Z"
    },
    {
      "platform": "linux",
      "product": "libcoap-doc",
      "release": "Fedora 43",
      "fixedVersion": "4.3.5b-1.fc43",
      "fix": "FEDORA-2026-0CE923A09D",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-0ce923a09d",
      "released": "2026-04-17T10:02:36Z"
    },
    {
      "platform": "linux",
      "product": "libcoap-utils",
      "release": "Fedora 43",
      "fixedVersion": "4.3.5b-1.fc43",
      "fix": "FEDORA-2026-0CE923A09D",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-0ce923a09d",
      "released": "2026-04-17T10:02:36Z"
    },
    {
      "platform": "linux",
      "product": "libcoap-utils-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "4.3.5b-1.fc43",
      "fix": "FEDORA-2026-0CE923A09D",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-0ce923a09d",
      "released": "2026-04-17T10:02:36Z"
    },
    {
      "platform": "linux",
      "product": "libcoap3",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.3.4-1.1\u002Bdeb13u3",
      "fix": "DEBIAN-CVE-2026-29013",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-29013",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "libcoap3",
      "release": "Debian 14",
      "fixedVersion": "4.3.5-3",
      "fix": "DEBIAN-CVE-2026-29013",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-29013",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}