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sqlparse CVE-2026-71491

| EUVDEUVD-2026-60309 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-08-17 GitHub_M GHSA-f2ff-p2ww-7p4p
Python Denial Of Service Sqlparse
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.7 HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Network-reachable with no auth or complexity; sole impact is CPU exhaustion causing availability loss with no confidentiality or integrity consequence.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Aug 17, 2026 - 18:16 EUVD
Source Code Evidence Fetched
Aug 17, 2026 - 17:53 vuln.today
Analysis Generated
Aug 17, 2026 - 17:53 vuln.today
CVE Published
Aug 17, 2026 - 17:16 cve.org
HIGH 8.7

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 17,095 pypi packages depend on sqlparse (723 direct, 16,427 indirect)

Ecosystem-wide dependent count for version 0.6.0.

DescriptionCVE.org

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.

Articles & Coverage 1

News 10 New Python Vulnerabilities - 3 Critical, 7 High, 2 With POC Aug 18, 2026

AnalysisAI

Quadratic CPU consumption in sqlparse's group_comments function (grouping.py) allows remote unauthenticated denial of service against any Python application that passes attacker-controlled input to sqlparse.parse() or sqlparse.format(sql, strip_comments=True). A comment-only payload of roughly 250 KB forces minutes of CPU burn regardless of the MAX_GROUPING_TOKENS guard, because group_comments executes before that cap is checked. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft comment-only SQL payload (~250 KB)
Delivery
Submit to network-exposed endpoint accepting SQL input
Exploit
Application invokes sqlparse.parse() or format(sql, strip_comments=True)
Execution
group_comments enters O(n²) rescan loop
Persist
CPU core saturated for minutes per request
Impact
Application unavailability / denial of service
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Vulnerability AssessmentAI

Exploitation The target application must pass attacker-controlled SQL text to either sqlparse.parse() or sqlparse.format() with the strip_comments=True argument - no other configuration is required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:H) scores 8.7 and accurately reflects the threat: network-reachable, zero authentication, no attack complexity, with high availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted HTTP request containing a comment-only SQL string (e.g., '-- c\n' repeated thousands of times, roughly 250 KB) to any endpoint that passes user input through sqlparse.parse() or sqlparse.format(sql, strip_comments=True). A public proof-of-concept demonstrates the attack is trivially reproducible in Python. …
Remediation Vendor-released patch: sqlparse 0.6.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all internal applications and services using sqlparse and assess which accept untrusted input. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-71491 vulnerability details – vuln.today
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