UBUNTU-CVE-2026-5720 (CVE-2026-5720)

Vulnerability from osv_ubuntu – Published: 2026-04-17 22:16 – Updated: 2026-09-07 16:43 – Source website
VLAI
Details

miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.

Severity
7.1 (High)
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "miniupnpd",
            "binary_version": "1.8.20140523-4.1+deb9u2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "miniupnpd",
        "purl": "pkg:deb/ubuntu/miniupnpd@1.8.20140523-4.1+deb9u2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.8.20140523-4.1+deb9u2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.20140523-4",
        "1.8.20140523-4.1+deb9u1build0.16.04.1",
        "1.8.20140523-4.1+deb9u2build0.16.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "miniupnpd",
            "binary_version": "2.0.20171212-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "miniupnpd",
        "purl": "pkg:deb/ubuntu/miniupnpd@2.0.20171212-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.20171212-2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.20140523-4.1",
        "1.8.20140523-4.2",
        "2.0.20171212-1",
        "2.0.20171212-2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "miniupnpd",
            "binary_version": "2.1-6.1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "miniupnpd",
        "purl": "pkg:deb/ubuntu/miniupnpd@2.1-6.1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1-6.1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1-6ubuntu2",
        "2.1-6.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "miniupnpd",
            "binary_version": "2.2.3-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "miniupnpd-iptables",
            "binary_version": "2.2.3-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "miniupnpd-nftables",
            "binary_version": "2.2.3-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "miniupnpd",
        "purl": "pkg:deb/ubuntu/miniupnpd@2.2.3-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.3-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.1-1",
        "2.2.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "miniupnpd",
            "binary_version": "2.3.4-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "miniupnpd-iptables",
            "binary_version": "2.3.4-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "miniupnpd-nftables",
            "binary_version": "2.3.4-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "miniupnpd",
        "purl": "pkg:deb/ubuntu/miniupnpd@2.3.4-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.4-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.3-1",
        "2.3.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "miniupnpd",
            "binary_version": "2.3.9-2"
          },
          {
            "binary_name": "miniupnpd-iptables",
            "binary_version": "2.3.9-2"
          },
          {
            "binary_name": "miniupnpd-nftables",
            "binary_version": "2.3.9-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "miniupnpd",
        "purl": "pkg:deb/ubuntu/miniupnpd@2.3.9-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.7-2",
        "2.3.9-2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "miniupnpd",
            "binary_version": "2.3.9-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "miniupnpd-iptables",
            "binary_version": "2.3.9-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "miniupnpd-nftables",
            "binary_version": "2.3.9-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "miniupnpd",
        "purl": "pkg:deb/ubuntu/miniupnpd@2.3.9-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.9-2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.9-2",
        "2.3.9-2build1"
      ]
    }
  ],
  "aliases": [],
  "details": "miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.",
  "id": "UBUNTU-CVE-2026-5720",
  "modified": "2026-09-07T16:43:46Z",
  "published": "2026-04-17T22:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-5720"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-5720"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8731-1"
    }
  ],
  "related": [
    "USN-8731-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-5720"
  ]
}



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