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lwip — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2026-8836

A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.

Products
lwip
Affected versions
2.1.2+dfsg1-1, 2.1.2+dfsg1-4, 2.1.2+dfsg1-8, 2.1.2+dfsg1-9, 2.1.2-3, 2.1.2-5.1, 2.1.3+dfsg1-1, 2.1.3+dfsg1-2, 2.1.3+dfsg1-4, 2.2.0+dfsg1-2, 2.2.0+dfsg1-3, 2.2.0+dfsg1-4, 2.2.0+dfsg1-5, 2.2.0+dfsg1-6, 2.2.0+dfsg1-6.1, 2.2.0+dfsg1-6.1build1, 2.2.0+dfsg1-6.1build2, 2.2.1+dfsg1-1, 2.2.1+dfsg1-2, 2.2.1+dfsg1-3, 2.2.1+dfsg1-4, 2.2.1+dfsg1-5, 2.2.1+dfsg1-7
Fixed versions
2.1.2+dfsg1-4ubuntu0.1~esm1, 2.1.3+dfsg1-1ubuntu0.1~esm1, 2.2.0+dfsg1-6.1ubuntu0.1~esm1, 2.2.1+dfsg1-4ubuntu0.1~esm1
CVEs
CVE-2026-8836
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 03:30 UTC · Revision 1

Source evidence

UBUNTU-CVE-2026-8836

core-osv · Original source

Published 18 May 2026, 19:16 UTC

A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.

osv:UBUNTU-CVE-2026-8836

lwip

Fixed versions: 2.1.2+dfsg1-4ubuntu0.1~esm1

lwip

Fixed versions: 2.1.3+dfsg1-1ubuntu0.1~esm1

lwip

Fixed versions: 2.2.0+dfsg1-6.1ubuntu0.1~esm1

lwip

Fixed versions: Not specified

lwip

Fixed versions: Not specified

lwip

Fixed versions: 2.2.1+dfsg1-4ubuntu0.1~esm1

Complete source record
{
  "id": "7d4fc87ed6d249faa2015233896c1f806b91afa261160cc269a4a4784beffd57",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-8836",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-8836",
    "summary": "A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.",
    "evidence": "osv:UBUNTU-CVE-2026-8836",
    "products": [
      {
        "name": {
          "value": "lwip",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.1.2+dfsg1-4ubuntu0.1~esm1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.1.2-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.1.2-5.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.1.2+dfsg1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "2.1.2+dfsg1-4",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "lwip",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.1.3+dfsg1-1ubuntu0.1~esm1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.1.2+dfsg1-8",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.1.2+dfsg1-9",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "2.1.3+dfsg1-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "lwip",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.2.0+dfsg1-6.1ubuntu0.1~esm1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.1.3+dfsg1-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.1.3+dfsg1-4",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-3",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-4",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-5",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-6",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-6.1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-6.1build1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "2.2.0+dfsg1-6.1build2",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "lwip",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.2.1+dfsg1-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "2.2.1+dfsg1-2",
            "evidence": "/affected/3/versions"
          }
        ]
      },
      {
        "name": {
          "value": "lwip",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "2.2.1+dfsg1-4",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "2.2.1+dfsg1-5",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "2.2.1+dfsg1-7",
            "evidence": "/affected/4/versions"
          }
        ]
      },
      {
        "name": {
          "value": "lwip",
          "evidence": "/affected/5/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.2.1+dfsg1-4ubuntu0.1~esm1",
            "evidence": "/affected/5/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "2.2.1+dfsg1-2",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "2.2.1+dfsg1-3",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "2.2.1+dfsg1-4",
            "evidence": "/affected/5/versions"
          }
        ]
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "UBUNTU-CVE-2026-8836",
      "aliases": [
        "UBUNTU-CVE-2026-8836"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        },
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.1.2+dfsg1-4ubuntu0.1~esm1"
                }
              ]
            }
          ],
          "package": {
            "name": "lwip",
            "purl": "pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Ffocal",
            "ecosystem": "Ubuntu:Pro:20.04:LTS"
          },
          "versions": [
            "2.1.2-3",
            "2.1.2-5.1",
            "2.1.2+dfsg1-1",
            "2.1.2+dfsg1-4"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblwip0",
                "binary_version": "2.1.2+dfsg1-4ubuntu0.1~esm1"
              }
            ],
            "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.1.3+dfsg1-1ubuntu0.1~esm1"
                }
              ]
            }
          ],
          "package": {
            "name": "lwip",
            "purl": "pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fjammy",
            "ecosystem": "Ubuntu:Pro:22.04:LTS"
          },
          "versions": [
            "2.1.2+dfsg1-8",
            "2.1.2+dfsg1-9",
            "2.1.3+dfsg1-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblwip0",
                "binary_version": "2.1.3+dfsg1-1ubuntu0.1~esm1"
              }
            ],
            "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.0+dfsg1-6.1ubuntu0.1~esm1"
                }
              ]
            }
          ],
          "package": {
            "name": "lwip",
            "purl": "pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fnoble",
            "ecosystem": "Ubuntu:Pro:24.04:LTS"
          },
          "versions": [
            "2.1.3+dfsg1-2",
            "2.1.3+dfsg1-4",
            "2.2.0+dfsg1-2",
            "2.2.0+dfsg1-3",
            "2.2.0+dfsg1-4",
            "2.2.0+dfsg1-5",
            "2.2.0+dfsg1-6",
            "2.2.0+dfsg1-6.1",
            "2.2.0+dfsg1-6.1build1",
            "2.2.0+dfsg1-6.1build2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblwip0t64",
                "binary_version": "2.2.0+dfsg1-6.1ubuntu0.1~esm1"
              }
            ],
            "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "lwip",
            "purl": "pkg:deb/ubuntu/lwip?arch=source&distro=questing",
            "ecosystem": "Ubuntu:25.10"
          },
          "versions": [
            "2.2.1+dfsg1-1",
            "2.2.1+dfsg1-2"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblwip0t64",
                "binary_version": "2.2.1+dfsg1-2"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "lwip",
            "purl": "pkg:deb/ubuntu/lwip?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "2.2.1+dfsg1-4",
            "2.2.1+dfsg1-5",
            "2.2.1+dfsg1-7"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblwip0t64",
                "binary_version": "2.2.1+dfsg1-7"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.2.1+dfsg1-4ubuntu0.1~esm1"
                }
              ]
            }
          ],
          "package": {
            "name": "lwip",
            "purl": "pkg:deb/ubuntu/lwip?arch=source&distro=esm-apps%2Fresolute",
            "ecosystem": "Ubuntu:Pro:26.04:LTS"
          },
          "versions": [
            "2.2.1+dfsg1-2",
            "2.2.1+dfsg1-3",
            "2.2.1+dfsg1-4"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-8836.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "liblwip0t64",
                "binary_version": "2.2.1+dfsg1-4ubuntu0.1~esm1"
              }
            ],
            "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
          }
        }
      ],
      "modified": "2026-10-17T13:01:15.652201250Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-8836"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-8836",
        "https://www.cve.org/CVERecord?id=CVE-2026-8836",
        "https://savannah.nongnu.org/bugs/?68194",
        "https://cgit.git.savannah.gnu.org/cgit/lwip.git/commit/?id=0c957ec03054eb6c8205e9c9d1d05d90ada3898c",
        "https://github.com/lwip-tcpip/lwip/commit/0c957ec03054eb6c8205e9c9d1d05d90ada3898c",
        "https://vuldb.com/submit/829798",
        "https://vuldb.com/vuln/364474",
        "https://vuldb.com/vuln/364474/cti",
        "https://ubuntu.com/security/notices/USN-8423-1"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-8836",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 361406,
  "published_at": "2026-05-18T19:16:00+00:00"
}