flex — security advisory

{
  "id": "1cc1677ec56d59c64e28ec308ad9f892b4adb0474dc42df1a4d67be9bbd71177",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2006-0459",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2006-0459",
    "summary": "flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing (1) REJECT statements or (2) trailing context rules, which causes flex to generate code that contains a buffer overflow that might allow context-dependent attackers to execute arbitrary code.",
    "evidence": "osv:DEBIAN-CVE-2006-0459",
    "products": [
      {
        "name": {
          "value": "flex",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.5.33-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "flex",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.5.33-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "flex",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.5.33-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "DEBIAN-CVE-2006-0459",
      "aliases": [
        "DEBIAN-CVE-2006-0459"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.5.33-1"
                }
              ]
            }
          ],
          "package": {
            "name": "flex",
            "purl": "pkg:deb/debian/flex?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2006-0459.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.5.33-1"
                }
              ]
            }
          ],
          "package": {
            "name": "flex",
            "purl": "pkg:deb/debian/flex?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2006-0459.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.5.33-1"
                }
              ]
            }
          ],
          "package": {
            "name": "flex",
            "purl": "pkg:deb/debian/flex?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2006-0459.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-22T23:47:20.911154279Z",
      "provider": "osv",
      "upstream": [
        "CVE-2006-0459"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2006-0459"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2006-0459",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 410285,
  "published_at": "2006-03-29T23:02:00+00:00"
}