CVE-2026-84305

Name	CVE-2026-84305
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1146628

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
sqlparse (PTS)	bookworm	0.4.2-1+deb12u1	vulnerable
	trixie	0.5.3-1	vulnerable
	forky, sid	0.5.5-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
sqlparse	source	(unstable)	(unfixed)			1146628

Notes

[trixie] - sqlparse <no-dsa> (Minor issue)
https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-cfqr-cjx5-5jcm
Fixed by: https://github.com/andialbrecht/sqlparse/commit/a51df6d9e2d31b44be9adb6bc8732517db6bf96b (0.6.0)