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CVE-2026-12075 is a server-side request forgery vulnerability in the Natural Language Toolkit (NLTK) URL handling protections implemented in nltk.pathsec.urlopen. A DNS rebinding condition allows an attacker to bypass the library's SSRF filtering logic, including documented ENFORCE mode protections. The issue affects code paths that rely on nltk.pathsec for URL safety, including nltk.download and nltk.data.load. By supplying a crafted URL that resolves benignly during validation and then rebinds to a prohibited internal destination at request time, an attacker can cause the application to issue HTTP requests to internal-only resources that the protection layer was intended to block.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
nltk.pathsec filtering, including strict ENFORCE mode.If you can’t patch tonight, do this now.
nltk.pathsec, including ENFORCE mode, as a sufficient security boundary for untrusted URLs until patched. Prevent attacker-controlled input from reaching nltk.download, nltk.data.load, or nltk.pathsec.urlopen. Apply external SSRF defenses such as restrictive outbound network policies, segmentation of internal services, and blocking access to instance metadata services from application workloads where not explicitly required.Patch, then assume compromise.
nltk package to version 3.10.0 or later.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
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