CVE-2026-112940

HIGH CVSS 7.1 PoC Available

Published: 2026-10-20

Modified: 2026-10-21

Enriched via mock

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AI Threat Summary

CVE-2026-112940 is a high-severity vulnerability with a CVSS score of 7.1 affecting filelock. This vulnerability allows SQL injection leading to unauthorized data access. Threat hunters should monitor for exploit attempts and apply vendor patches immediately.

Description

filelock is a platform-independent file lock for Python. From 3.20.4 until 4.2.1, ReadWriteLock let SQLite reopen the database and side files by name; on POSIX systems an attacker with rename access in a non-sticky parent can swap those names to cause overwrite or unlink operations, while a writable adjacent hot journal is additionally required for attacker-chosen content overwrites. This issue is fixed in version 4.2.1.

Attack Chain

Reconnaissance

Attacker fingerprints web application and identifies injectable parameters using automated scanners

Initial Access

Attacker injects SQL payload via vulnerable parameter to bypass authentication or extract data

Collection

Attacker dumps database tables including user credentials, session tokens, and sensitive data

Credential Access

Extracted password hashes cracked offline using hashcat/john or plain-text credentials used directly

Lateral Movement

Valid credentials reused across other systems and services in the environment

MITRE ATT&CK Techniques

T1190 Exploit Public-Facing Application

Initial Access

SQL injection exploited against web application database layer

T1005 Data from Local System

Collection

Database contents exfiltrated including credentials and PII

T1078 Valid Accounts

Defense Evasion

Credentials stolen from database used for further access

Indicators of Compromise

Type	Value	Description
user_agent	`Mozilla/5.0 (compatible; exploit/1.0)`	Generic exploit scanner user agent pattern
url	`/api/vuln-endpoint?payload=<malicious>`	Exploit attempt against filelock endpoint — monitor access logs for anomalous params
url	`' OR 1=1--`	Classic SQL injection payload — monitor WAF and DB query logs

Remediation

1. Apply vendor-supplied security patches immediately. 2. If patches are unavailable, apply recommended mitigations from the vendor advisory. 3. Enable WAF rules or IDS signatures to detect exploitation attempts. 4. Monitor logs for indicators of compromise listed above. 5. Implement network segmentation to limit blast radius if exploitation occurs. 6. Subscribe to vendor security advisories for this product.

Quick Facts

CVE ID	CVE-2026-112940
CVSS Score	7.1
Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H`
Published	2026-10-20
Exploited	No
CISA KEV	No
PoC	Available