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THREAT OPS › Threat News › [GHSA] GHSA-qvv7-cg9c-w4x3 (high) — Natural Language Toolkit (NLTK): DNS-rebinding SSRF filter bypass in nltk.pathsec.urlopen (nltk.download / nltk.data.load) defeats ENFORCE mode

[GHSA] GHSA-qvv7-cg9c-w4x3 (high) — Natural Language Toolkit (NLTK): DNS-rebinding SSRF filter bypass in nltk.pathsec.urlopen (nltk.download / nltk.data.load) defeats ENFORCE mode

highgithub_advisoriesPublished 2026-07-31

GHSA-qvv7-cg9c-w4x3 Severity: high CVE: CVE-2026-12075

Natural Language Toolkit (NLTK): DNS-rebinding SSRF filter bypass in nltk.pathsec.urlopen (nltk.download / nltk.data.load) defeats ENFORCE mode

### Summary `nltk.pathsec` provides an SSRF filter that NLTK documents as a security control, blocking loopback, private, link-local, and multicast ranges (including obfuscated forms) and recommendin

MITRE ATT&CK techniques

Cloud AccountT1087.004
Cloud AccountT1136.003
CredentialsT1589.001

Indicators of compromise

CVE-2026-12075cve
http://127.0.0.1:{port}/url
http://{ATTACKER_HOST}:{port}/url
93.184.216.34ipv4

Original source: https://github.com/advisories/GHSA-qvv7-cg9c-w4x3