{"id":"CVE-2026-71491","summary":"sqlparse: Quadratic O(n²) DoS in group_comments","details":"sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, group_comments in sqlparse/engine/grouping.py repeatedly rescans comment-only statements before the MAX_GROUPING_TOKENS guard, causing quadratic CPU consumption through sqlparse.parse() and sqlparse.format(sql, strip_comments=True). This issue is fixed in version 0.6.0.","aliases":["GHSA-f2ff-p2ww-7p4p","PYSEC-2026-3697"],"modified":"2026-09-10T18:26:49.667939929Z","published":"2026-08-17T17:16:48.973Z","related":["SUSE-SU-2026:3762-1","SUSE-SU-2026:3906-1","SUSE-SU-2026:3907-1","SUSE-SU-2026:3910-1","openSUSE-SU-2026:11557-1","openSUSE-SU-2026:21690-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-400","CWE-407"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71491.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71491.json"},{"type":"ADVISORY","url":"https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-f2ff-p2ww-7p4p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71491"},{"type":"FIX","url":"https://github.com/andialbrecht/sqlparse/commit/ef2012a5eeb491e604dea2b00d516904a3830c87"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/andialbrecht/sqlparse","events":[{"introduced":"0"},{"fixed":"ef2012a5eeb491e604dea2b00d516904a3830c87"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"0.6.0"}]}}],"versions":["0.5.5","0.5.4","0.5.3","0.5.2","0.5.1","0.5.0","0.4.4","0.4.3","0.4.2","0.4.1","0.4.0","0.3.1","0.3.0","0.2.4","0.2.3","0.2.2","0.2.1","0.2.0","0.1.18","0.1.17","0.1.16","0.1.15","0.1.14","0.1.13","0.1.12","0.1.11","0.1.10","0.1.9","0.1.8","0.1.7","0.1.6","0.1.5","0.1.3","0.1.2","0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71491.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}