CVE-2026-84305
MediumCVSS 5.1Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
A vulnerability in sqlparse (a SQL parser module for Python) before version 0.6.0 causes excessive CPU consumption when formatting queries with parenthesized tuple lists, potentially leading to request delays and reduced throughput.
Risk Assessment
The attack can cause server overload and slow down applications using sqlparse, impacting service availability.
Recommendation
Update sqlparse to version 0.6.0 or later.
Other vulnerabilities in sqlparse
See all- CVE-2026-71491High
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.
- CVE-2026-59894Medium
sqlparse before 0.6.0 has a vulnerability in sqlparse/filters/output.py that fails to escape existing backslashes before quotes in output_format='python' and output_format='php' and the corresponding sqlformat -l modes, allowing crafted SQL to terminate the generated string and inject Python or PHP code when a downstream consumer executes or imports the generated source.
- CVE-2026-59893High
sqlparse before version 0.6.0 has a performance issue: SQL_REGEX in sqlparse/keywords.py and the per-position loop in sqlparse/lexer.py repeatedly scan unmatched dollar-quoted literal and multiline-comment delimiters, causing quadratic CPU consumption through sqlparse.parse(), sqlparse.format(), and sqlparse.split(). This issue is fixed in version 0.6.0.
- CVE-2026-54284High
sqlparse before version 0.6.0 has a performance issue: TokenList construction and string conversion in sqlparse/sql.py repeatedly flatten nested token subtrees constructed by group_parenthesis and group_case, causing quadratic CPU consumption through sqlparse.parse(), sqlparse.format(), and sqlparse.split() before depth and token limits terminate processing. This issue is fixed in version 0.6.0.
Original NVD description (English source)
sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, sqlparse.format(sql, reindent=True) and sqlformat --reindent route attacker-controlled parenthesized tuple lists through ReindentFilter._get_offset() in sqlparse/filters/reindent.py, where _flatten_up_to_token() repeatedly rebuilds and joins the statement prefix. Thousands of offset calculations walk an expanding token tree, producing quadratic CPU consumption for inputs that remain below MAX_GROUPING_TOKENS and causing request delays, reduced throughput, or worker starvation. This issue is fixed in version 0.6.0.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS