Inefficient regular expression complexity in Sqlparse - CVE-2026-59893
Published: August 13, 2026
Vulnerability identifier: #VU142415
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-59893
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in the dollar-quoted SQL literal lexer and multiline comment patterns when parsing user-supplied SQL text. A remote attacker can send specially crafted SQL input with unmatched dollar-quote delimiters or unterminated comment openers to cause a denial of service.
A single crafted request carrying SQL text is sufficient to trigger sustained CPU exhaustion.
Affected software
Sqlparse
How to mitigate CVE-2026-59893
Install security update from vendor's website.
Sqlparse - update to 0.6.0