CVE-2026-12372

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.

• CWE-918

• https://huntr.com/bounties/2911b643-571c-42e4-b0c2-9a1fa6f491db

Published

Aug 9, 2026

Last Modified

Aug 9, 2026

Status

Received

• One Click Account Takeover in GranolaHow a notification link broke out of Electron and led to a one-click account takeover.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-12352This vulnerability allows an unauthenticated actor to bypass…5.9
• CVE-2026-12353An unauthenticated attacker could trigger an Out of Memory c…5.3
• CVE-2026-12357Heimdall Data Database Proxy generateFileContent CRLF Inject…7.2
• CVE-2026-1236The Envira Gallery for WordPress plugin for WordPress is vul…6.4
• CVE-2026-12360The JetEngine plugin for WordPress is vulnerable to SQL inje…7.5
• CVE-2026-1237Vulnerable cross-model authorization in juju. If a charm's c…2.1
• CVE-2026-12374Improper certificate validation and a time-of-check time-of-…6.4
• CVE-2026-12375The uncanny-automator-pro WordPress plugin before 7.3.0.6 wa…9.8
• CVE-2026-12376The Academy LMS WordPress plugin through 3.8.2 does not rest…4.3
• CVE-2026-12378The Appointment Booking Calendar Plugin and Scheduling Plugi…8.1
• CVE-2026-12379An Open Redirect vulnerability (CWE-601) exists in the OAuth…6.8
• CVE-2026-1238The SlimStat Analytics plugin for WordPress is vulnerable to…7.2