{"id":"CVE-2009-2940","aliases":["GHSA-xv6x-43gq-4hfj","PYSEC-2009-18"],"url":"https://o3.security/vulnerability/CVE-2009-2940","summary":"PyGreSQL Might Be Vulnerable to Encoding-Based SQL Injection","details":"PyGreSQL 3.8 did not use PostgreSQL’s safe `string` and `bytea` functions in its own escaping functions. As a result, applications written to use PyGreSQL’s escaping functions are vulnerable to SQL injections when processing certain multi-byte character sequences. Because the safe functions require a database connection, to maintain backwards compatibility, `pg.escape_string()` and `pg.escape_bytea()` are still available, but applications will have to be adjusted to use the new `pyobj.escape_string()` and `pyobj.escape_bytea()` functions. For example, code containing:\n\n```python\nimport pg\nconnection = pg.connect(...)\nescaped = pg.escape_string(untrusted_input)\n```\nshould be adjusted to use:\n\n```python\nimport pg\nconnection = pg.connect(...)\nescaped = connection.escape_string(untrusted_input)\n```","published":"2009-10-22T16:30:00Z","modified":"2026-05-20T08:11:27.458437139Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"pygresql","fixedVersion":null},{"ecosystem":"PyPI","name":"pygresql","fixedVersion":"4.1"}],"fix":{"url":"https://github.com/PyGreSQL/PyGreSQL/commit/8e19320b130946eed6f043297e3e4e005a523612","label":"PyGreSQL/PyGreSQL@8e19320"},"references":[{"type":"ADVISORY","url":"http://secunia.com/advisories/37046"},{"type":"ADVISORY","url":"http://secunia.com/advisories/37654"},{"type":"ADVISORY","url":"http://www.debian.org/security/2009/dsa-1911"},{"type":"WEB","url":"http://ubuntu.com/usn/usn-870-1"},{"type":"WEB","url":"http://www.osvdb.org/59028"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2009-2940"},{"type":"WEB","url":"https://github.com/PyGreSQL/PyGreSQL/commit/8e19320b130946eed6f043297e3e4e005a523612"},{"type":"WEB","url":"https://github.com/PyGreSQL/PyGreSQL/commit/f7237d773e6f4d5a7da3d99bb6bc5062bd07935e"},{"type":"PACKAGE","url":"https://github.com/PyGreSQL/PyGreSQL"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/pygresql/PYSEC-2009-18.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-05-20T08:11:27.458437139Z"}}