Vulnerability · Published Aug 17, 2026 · Assigned by GitHub_M
CVE-2026-71491sqlparse: Quadratic O(n²) DoS in group_comments
High 8.7
In plain English
A high-severity uncontrolled resource consumption in sqlparse from andialbrecht. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, group_comments in sqlparse/engine/grouping.py repeatedly rescans comment-only statements before the MAX_GROUPING_TOKENS guard, causing quadratic CPU consumption through sqlparse.parse() and sqlparse.format(sql, strip_comments=True). This issue is fixed in version 0.6.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | sqlparse | no fix listed | DEBIAN-CVE-2026-71491 |
| Debian:13 | sqlparse | no fix listed | DEBIAN-CVE-2026-71491 |
| Debian:14 | sqlparse | no fix listed | DEBIAN-CVE-2026-71491 |
| PyPI | sqlparse | 0.6.0 | PYSEC-2026-3697 |
| PyPI | sqlparse | 0.6.0 | GHSA-f2ff-p2ww-7p4p |
| Ubuntu:22.04:LTS | sqlparse | 0.4.2-1ubuntu0.22.04.3 | USN-8808-1 |
| Ubuntu:22.04:LTS | sqlparse | 0.4.2-1ubuntu0.22.04.3 | UBUNTU-CVE-2026-71491 |
| Ubuntu:24.04:LTS | sqlparse | 0.4.4-1ubuntu0.2 | UBUNTU-CVE-2026-71491 |
| Ubuntu:24.04:LTS | sqlparse | 0.4.4-1ubuntu0.2 | USN-8808-1 |
| Ubuntu:26.04:LTS | sqlparse | 0.5.4-1ubuntu0.1 | UBUNTU-CVE-2026-71491 |
| Ubuntu:26.04:LTS | sqlparse | 0.5.4-1ubuntu0.1 | USN-8808-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| andialbrecht | sqlparse | < 0.6.0 |
Weakness: CWE-400, CWE-407 · Vector: 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