Service interruption via quadratic unmatched-delimiter scans
Published Aug 17, 2026 · Updated Aug 17, 2026
Regular expression denial of service in Andi Albrecht sqlparse before 0.6.0 allows remote attackers to cause a service interrupt via crafted SQL text. SQL_REGEX patterns for dollar-quoted literals and multiline comments rescan the remaining input at each lexer position when closing delimiters are absent, producing quadratic CPU work. Exploitation requires an application to pass attacker-controlled SQL to parse(), format(), or split(); sustained requests can exhaust CPU and block that service.
Summary
What happened
Regular expression denial of service in Andi Albrecht sqlparse before 0.6.0 allows remote attackers to cause a service interrupt via crafted SQL text. SQL_REGEX patterns for dollar-quoted literals and multiline comments rescan the remaining input at each lexer position when closing delimiters are absent, producing quadratic CPU work. Exploitation requires an application to pass attacker-controlled SQL to parse(), format(), or split(); sustained requests can exhaust CPU and block that service.
The record
- CVE
- CVE-2026-59893
- Published
- Aug 17, 2026
- Updated
- Aug 17, 2026
- Vendor
- Andi Albrecht
- Product
- sqlparse
- Classifications
- CWE-1333, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 17, 2026CVE publishedPublication date reported by the CVE source.
- Aug 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.6.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream unmatched dollar-quote and multiline-comment PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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