ubuntu-cve-2026-44673
Vulnerability from osv_ubuntu
Published
2026-05-14 21:16
Modified
2026-05-14 21:16
Summary
Details

libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyang-cpp0.16",
            "binary_version": "0.16.105-3build1"
          },
          {
            "binary_name": "libyang0.16",
            "binary_version": "0.16.105-3build1"
          },
          {
            "binary_name": "python3-yang",
            "binary_version": "0.16.105-3build1"
          },
          {
            "binary_name": "yang-tools",
            "binary_version": "0.16.105-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libyang",
        "purl": "pkg:deb/ubuntu/libyang@0.16.105-3build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.16.105-1",
        "0.16.105-2",
        "0.16.105-3",
        "0.16.105-3build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyang-cpp1",
            "binary_version": "1.0.225-1.1"
          },
          {
            "binary_name": "libyang-tools",
            "binary_version": "1.0.225-1.1"
          },
          {
            "binary_name": "libyang1",
            "binary_version": "1.0.225-1.1"
          },
          {
            "binary_name": "yang-tools",
            "binary_version": "1.0.225-1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libyang",
        "purl": "pkg:deb/ubuntu/libyang@1.0.225-1.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.225-1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyang-tools",
            "binary_version": "2.0.112-6ubuntu2"
          },
          {
            "binary_name": "libyang2",
            "binary_version": "2.0.112-6ubuntu2"
          },
          {
            "binary_name": "libyang2-tools",
            "binary_version": "2.0.112-6ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libyang2",
        "purl": "pkg:deb/ubuntu/libyang2@2.0.112-6ubuntu2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.112-6",
        "2.0.112-6ubuntu1",
        "2.0.112-6ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyang-tools",
            "binary_version": "2.1.30-2.1ubuntu0.1"
          },
          {
            "binary_name": "libyang2-tools",
            "binary_version": "2.1.30-2.1ubuntu0.1"
          },
          {
            "binary_name": "libyang2t64",
            "binary_version": "2.1.30-2.1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libyang2",
        "purl": "pkg:deb/ubuntu/libyang2@2.1.30-2.1ubuntu0.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.30-2",
        "2.1.30-2.1",
        "2.1.30-2.1build1",
        "2.1.30-2.1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyang3",
            "binary_version": "3.13.5-2"
          },
          {
            "binary_name": "libyang3-tools",
            "binary_version": "3.13.5-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libyang",
        "purl": "pkg:deb/ubuntu/libyang@3.13.5-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.7.8-3",
        "3.12.2-1",
        "3.12.2-1ubuntu1",
        "3.13.5-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libyang3",
            "binary_version": "3.13.6-1"
          },
          {
            "binary_name": "libyang3-tools",
            "binary_version": "3.13.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libyang",
        "purl": "pkg:deb/ubuntu/libyang@3.13.6-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.13.5-2",
        "3.13.6-1"
      ]
    }
  ],
  "aliases": [],
  "details": "libyang is a YANG data modeling language library. Prior to SO 5.2.15, lyb_read_string() in src/parser_lyb.c contains an integer overflow that results in a heap buffer overflow when parsing a maliciously crafted LYB binary blob. An attacker who can supply LYB data to any libyang consumer (NETCONF server, sysrepo, etc.) can trigger a crash or potential heap corruption. This vulnerability is fixed in SO 5.2.15.",
  "id": "UBUNTU-CVE-2026-44673",
  "modified": "2026-05-14T21:16:00Z",
  "published": "2026-05-14T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44673"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-44673"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/CESNET/libyang/security/advisories/GHSA-vw2p-pq79-92xh"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-44673"
  ],
  "withdrawn": "2026-06-16T19:55:01Z"
}



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