{"items":[{"id":"NVI-00016431","kind":"vulnerability","title":"Duplicate Advisory: nltk: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"withdrawn","identifiers":["GHSA-qg9p-xrhj-435m"],"plain_summary":"GitHub lists this reviewed advisory for nltk. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-703fcca260642d4d8e8cd99aebf213f9"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-02T15:38:16.000Z","value":"5.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-703fcca260642d4d8e8cd99aebf213f9"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-703fcca260642d4d8e8cd99aebf213f9","url":"https://github.com/advisories/GHSA-qg9p-xrhj-435m","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-qg9p-xrhj-435m","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T02:21:43.711Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-703fcca260642d4d8e8cd99aebf213f9"],"technology":"nltk","known_exclusions":[],"conditions_summary":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-3gqm-fcw5-w839. This link is maintained to preserve external references.\n\n## Original Description\nNLTK before 3.10.0 (affected versions <= 3.9.4) contains a server-side request forgery (SSRF) vulnerability in the validate_network_url() function in nltk/pathsec.py. The _resolve_hostname() helper catches OSError and ValueError during socket.getaddrinfo() and returns an empty list; when DNS resolution fails, the validation loop executes no IP checks and the function fails open, allowing urlopen() to proceed without validation. An attacker who can trigger DNS resolution failures or use DNS rebinding can bypass SSRF protections and reach restricted network resources, including cloud metadata endpoints (e.g., 169.254.169.254).","public_affected_ranges":["<= 3.9.4"]}],"null_published_at":"2026-11-04T10:04:27.944Z","source_updated_at":"2026-09-02T15:38:16.000Z","source_disclosed_at":"2026-08-22T15:31:03.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T02:21:43.711Z"}],"next_cursor":null,"snapshot_revision":"42594"}