{"items":[{"id":"NVI-00013034","kind":"vulnerability","title":"NLTK network URL validation permits SSRF to RFC 6598 shared-address-space hosts","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-2jhm-w3mp-jcwr","CVE-2026-12372"],"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-0cc96415806cd5c815d05b6ce2b8f48d"],"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":"2026-10-02T23:11:24.000Z","value":"3.7 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-42be442d25fec09b6139807b84c5715b"},{"kind":"EPSS","as_of":"2026-11-01T12:00:16.000Z","value":"0.260%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.17727. Missing scores are unknown.","source_id":"sr-0cc96415806cd5c815d05b6ce2b8f48d"}],"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-42be442d25fec09b6139807b84c5715b","url":"https://github.com/advisories/GHSA-2jhm-w3mp-jcwr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-2jhm-w3mp-jcwr","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T01:40:00.567Z"},{"id":"sr-0cc96415806cd5c815d05b6ce2b8f48d","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-12372","publisher":"FIRST EPSS","observed_at":"2026-11-01T14:28:32.270Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-42be442d25fec09b6139807b84c5715b"],"technology":"nltk","known_exclusions":[],"conditions_summary":"A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The `nltk.pathsec.validate_network_url()` function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space (`100.64.0.0/10`). This occurs because Python's `ipaddress` module does not classify such addresses as `is_private` or `is_global`, and the current guard only checks `is_private` and a few explicit categories. An attacker who can influence a URL passed to NLTK's network-loading helpers can exploit this vulnerability to make a strict-mode application send requests to shared-address-space hosts, potentially exposing non-public infrastructure reachable from the application host. The impact is limited to SSRF-style confidentiality exposure, with no code execution claimed.","public_affected_ranges":["< 3.10.0"]}],"null_published_at":"2026-11-03T17:49:15.056Z","source_updated_at":"2026-10-02T23:11:24.000Z","source_disclosed_at":"2026-08-10T00:31:42.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-01T01:40:00.567Z"},{"id":"NVI-00013034","kind":"vulnerability","title":"NLTK network URL validation permits SSRF to RFC 6598 shared-address-space hosts","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-2jhm-w3mp-jcwr","CVE-2026-12372"],"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-42be442d25fec09b6139807b84c5715b"],"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":"2026-10-02T23:11:24.000Z","value":"3.7 low","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-42be442d25fec09b6139807b84c5715b"}],"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-42be442d25fec09b6139807b84c5715b","url":"https://github.com/advisories/GHSA-2jhm-w3mp-jcwr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-2jhm-w3mp-jcwr","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T01:40:00.567Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-42be442d25fec09b6139807b84c5715b"],"technology":"nltk","known_exclusions":[],"conditions_summary":"A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The `nltk.pathsec.validate_network_url()` function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space (`100.64.0.0/10`). This occurs because Python's `ipaddress` module does not classify such addresses as `is_private` or `is_global`, and the current guard only checks `is_private` and a few explicit categories. An attacker who can influence a URL passed to NLTK's network-loading helpers can exploit this vulnerability to make a strict-mode application send requests to shared-address-space hosts, potentially exposing non-public infrastructure reachable from the application host. The impact is limited to SSRF-style confidentiality exposure, with no code execution claimed.","public_affected_ranges":["< 3.10.0"]}],"null_published_at":"2026-11-01T07:29:12.910Z","source_updated_at":"2026-10-02T23:11:24.000Z","source_disclosed_at":"2026-08-10T00:31:42.000Z","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":"2026-11-01T01:40:00.567Z"}],"next_cursor":null,"snapshot_revision":"42594"}