Security advisory

{
  "id": "bc3cb16e54c540ec9d0e8cdd987d55c65eeb16180eff42a4d0818722f43a7fb6",
  "url": "https://osv.dev/vulnerability/CVE-2020-23914",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-23914",
    "summary": "An issue was discovered in cpp-peglib through v0.1.12. A NULL pointer dereference exists in the peg::AstOptimizer::optimize() located in peglib.h. It allows an attacker to cause Denial of Service.",
    "evidence": "osv:CVE-2020-23914",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-23914",
      "aliases": [
        "CVE-2020-23914"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/yhirose/cpp-peglib",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "14305f9f53cde207568f21675a1b9294a3ab28b4"
                },
                {
                  "fixed": "0061f393de54cf0326621c079dc2988336d1ebb3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:cpp-peglib_project:cpp-peglib:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.1.12"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0061f393de54cf0326621c079dc2988336d1ebb3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.1.12",
            "v0.1.11",
            "v0.1.10",
            "v0.1.9",
            "v0.1.8",
            "v0.1.7",
            "v0.1.6",
            "v0.1.5",
            "v0.1.4",
            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-23914.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-23914-69176862",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                },
                "source": "https://github.com/yhirose/cpp-peglib/commit/0061f393de54cf0326621c079dc2988336d1ebb3",
                "target": {
                  "file": "peglib.h"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:24:42Z"
          }
        }
      ],
      "modified": "2026-10-20T13:24:42.417627012Z",
      "provider": "osv",
      "references": [
        "https://github.com/yhirose/cpp-peglib/commit/0061f393de54cf0326621c079dc2988336d1ebb3",
        "https://github.com/yhirose/cpp-peglib/issues/121"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-23914",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387644,
  "published_at": "2021-04-21T18:15:08.237+00:00"
}