CVE-2021-32839: high-severity vulnerability in andialbrecht sqlparse
Regular Expression Denial of Service in sqlparse
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 2.3%
sqlparse is a non-validating SQL parser module for Python. In sqlparse versions 0.4.0 and 0.4.1 there is a regular Expression Denial of Service in sqlparse vulnerability. The regular expression may cause exponential backtracking on strings containing many repetitions of '\r\n' in SQL comments. Only the formatting feature that removes comments from SQL statements is affected by this regular expression. As a workaround don't use the sqlformat.format function with keyword strip_comments=True or the --strip-comments command line flag when using the sqlformat command line tool. The issues has been fixed in sqlparse 0.4.2.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
andialbrecht · sqlparseRelated CVEs — andialbrecht sqlparse
In the same product, most dangerous first.
CVE-2023-30608MEDIUMParser contains an inefficient regular expression in sqlparseEPSS 1.0%CVE-2026-59893HIGHsqlparse: Inefficient Regex Handling of Dollar-Quoted SQL Literals Leads to ReDoS (Denial of Service)EPSS 0.3%CVE-2026-54284HIGHsqlparse: TokenList.__init__ materializes O(subtree) value per group, causing CPU DoS before depth/token caps triggerEPSS 0.3%CVE-2026-71491HIGHsqlparse: Quadratic O(n²) DoS in group_commentsEPSS 0.3%CVE-2026-84305MEDIUMsqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumptionEPSS 0.2%CVE-2026-112307HIGHsqlparse through 0.6.0 PHP Code Injection via output_format='php'EPSS 0.1%