Medium 5.1Published Sep 1, 2026

CVE-2026-84305sqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumption

Updated under an hour ago (2026-10-19 10:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for andialbrecht sqlparse

Exploited in the last 30 days

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.

CVSS: 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness (CWE): CWE-407
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

andialbrecht sqlparse andialbrecht:sqlparse (from the name)	before 0.6.0	CNA record

References

https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-cfqr-cjx5-5jcmx-refsource-confirm
https://github.com/andialbrecht/sqlparse/commit/a51df6d9e2d31b44be9adb6bc8732517db6bf96bx-refsource-misc
https://github.com/andialbrecht/sqlparse/releases/tag/0.6.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.