🛡️ CVE-2026-12372

🟢 CVSS 3.7 — Low ✅ No Known Exploit CWE-918 NVD
3.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2026-12372 is classified as CWE-918: Server-Side Request Forgery (SSRF). The server fetches a URL supplied by the caller, which can be pointed at internal systems it alone can reach.

Affected software

CVE-2026-12372 is recorded against 1 package.

  • unknown

Timeline and source

Published on 9 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

huntr.com

Details

Severity LOW
CVSS Score 3.7
CVSS Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-918
Public Exploit ✅ No
Source NVD
Published 2026-08-09
Updated 2026-08-11
Modified 2026-08-09
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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