llama.cpp — security advisory

{
  "id": "847edfcba5280aa3e1376f4b1ca004d2e795c0fa4b0ab12e3240ff71b9a6fe61",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18581",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-18581",
    "summary": "A vulnerability was determined in ggml-org llama.cpp e15efe0. Affected by this issue is some unknown functionality of the file common/jinja/parser.cpp of the component Jinja Minja Template Parser. Executing a manipulation with the input {{9|9|{ can lead to reachable assertion. The attack requires local access. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.",
    "evidence": "osv:UBUNTU-CVE-2026-18581",
    "products": [
      {
        "name": {
          "value": "llama.cpp",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "8681+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "9721+dfsg-1ubuntu1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "10438+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "10438+dfsg-1ubuntu1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "llama.cpp",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5882+dfsg-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8064+dfsg-1ubuntu1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8681+dfsg-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "low",
    "structured": {
      "id": "UBUNTU-CVE-2026-18581",
      "aliases": [
        "UBUNTU-CVE-2026-18581"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
        },
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "llama.cpp",
            "purl": "pkg:deb/ubuntu/llama.cpp?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "8681+dfsg-1",
            "9721+dfsg-1ubuntu1",
            "10438+dfsg-1",
            "10438+dfsg-1ubuntu1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18581.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libllama0",
                "binary_version": "10438+dfsg-1ubuntu1"
              },
              {
                "binary_name": "llama.cpp",
                "binary_version": "10438+dfsg-1ubuntu1"
              },
              {
                "binary_name": "llama.cpp-examples",
                "binary_version": "10438+dfsg-1ubuntu1"
              },
              {
                "binary_name": "llama.cpp-services",
                "binary_version": "10438+dfsg-1ubuntu1"
              },
              {
                "binary_name": "llama.cpp-tests",
                "binary_version": "10438+dfsg-1ubuntu1"
              },
              {
                "binary_name": "llama.cpp-tools",
                "binary_version": "10438+dfsg-1ubuntu1"
              },
              {
                "binary_name": "llama.cpp-tools-extra",
                "binary_version": "10438+dfsg-1ubuntu1"
              },
              {
                "binary_name": "python3-gguf",
                "binary_version": "10438+dfsg-1ubuntu1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "llama.cpp",
            "purl": "pkg:deb/ubuntu/llama.cpp?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "5882+dfsg-2",
            "8064+dfsg-1ubuntu1",
            "8681+dfsg-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18581.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libllama0",
                "binary_version": "8681+dfsg-1"
              },
              {
                "binary_name": "llama.cpp",
                "binary_version": "8681+dfsg-1"
              },
              {
                "binary_name": "llama.cpp-examples",
                "binary_version": "8681+dfsg-1"
              },
              {
                "binary_name": "llama.cpp-tests",
                "binary_version": "8681+dfsg-1"
              },
              {
                "binary_name": "llama.cpp-tools",
                "binary_version": "8681+dfsg-1"
              },
              {
                "binary_name": "llama.cpp-tools-extra",
                "binary_version": "8681+dfsg-1"
              },
              {
                "binary_name": "python3-gguf",
                "binary_version": "8681+dfsg-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:56:35.759500117Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-18581"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-18581",
        "https://www.cve.org/CVERecord?id=CVE-2026-18581",
        "https://github.com/ggml-org/llama.cpp/issues/25282",
        "https://drive.proton.me/urls/R8D8NGZ6Z0#C2cVZYn5z1Xc",
        "https://github.com/ggml-org/llama.cpp/",
        "https://vuldb.com/cve/CVE-2026-18581",
        "https://vuldb.com/submit/799118",
        "https://vuldb.com/vuln/385409",
        "https://vuldb.com/vuln/385409/cti"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-18581",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 355832,
  "published_at": "2026-08-03T01:16:00+00:00"
}