wren-lang wren Source File wren_compiler.c peekChar out-of-bounds

{
  "id": "386f6bfd617649c1384ca08a96796f32e01cbfc28c898f8281fb58b2953c8dbe",
  "url": "https://osv.dev/vulnerability/CVE-2026-2858",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wren-lang wren Source File wren_compiler.c peekChar out-of-bounds",
    "summary": "A vulnerability was identified in wren-lang wren up to 0.4.0. This affects the function peekChar of the file src/vm/wren_compiler.c of the component Source File Parser. Such manipulation leads to out-of-bounds read. The attack needs to be performed locally. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.",
    "evidence": "osv:CVE-2026-2858",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-2858",
      "aliases": [
        "CVE-2026-2858"
      ],
      "metrics": [
        {
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wren-lang/wren",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6bcc64eb61772b2c957a65f9d577c59fcd1d9158"
                },
                {
                  "last_affected": "7d3f063e87acebf3e7db3ff6455826e6a30f570e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.1"
                      },
                      {
                        "last_affected": "0.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.2"
                      },
                      {
                        "last_affected": "0.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.3"
                      },
                      {
                        "last_affected": "0.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0.4.0"
                      },
                      {
                        "last_affected": "0.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  },
                  {
                    "cpe": "cpe:2.3:a:wren:wren:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.1",
            "0.2",
            "0.3",
            "0.4.0",
            "0.4.0-pre",
            "0.3.0",
            "0.2.0",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2858.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.371362953Z",
      "provider": "osv",
      "references": [
        "https://github.com/wren-lang/wren/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2858.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-2858",
        "https://vuldb.com/?id.347097",
        "https://vuldb.com/?submit.754489",
        "https://github.com/wren-lang/wren/issues/1217",
        "https://vuldb.com/?ctiid.347097",
        "https://github.com/oneafter/0122/blob/main/i1217/repro"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-119",
          "CWE-125"
        ],
        "cna_assigner": "VulDB",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2858.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-2858",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500456,
  "published_at": "2026-02-20T21:32:08.945+00:00"
}