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CVE-2026-71491 is an algorithmic-complexity vulnerability in the Python sqlparse library before version 0.6.0. The group_comments function repeatedly rescans the remaining token stream when processing comment-only SQL statements, producing quadratic O(n²) CPU consumption. The vulnerable processing is reachable through sqlparse.parse() and sqlparse.format(sql, strip_comments=True). It occurs before the MAX_GROUPING_TOKENS guard, so that token limit does not protect against this denial-of-service condition. Version 0.6.0 fixes the behavior by stopping comment grouping when no non-comment terminator is found.
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A network-accessible vulnerability with high availability impact and no stated confidentiality or integrity impact. The supplied CVSS vectors indicate low attack complexity, no required privileges, and no user interaction. The affected product and underlying flaw are not identified. A patch was published on August 18, 2026; the reference reports no known exploits.
Denial-of-service vulnerability in sqlparse caused by quadratic CPU consumption during comment grouping. The advisory supplies an updated python3.12-sqlparse package.
Quadratic CPU consumption during comment grouping in sqlparse can cause denial of service. Updated sqlparse packages are supplied in the advisory.
Quadratic CPU consumption in comment grouping enables denial of service in python3.12-sqlparse.
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Cross-references every affected SKU, including bundled OEM variants.
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