CVE-2026-12243
CVE-2026-12243: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh7.5
High [CVE-2026-12243] Information disclosure via path traversal vulnerability
CVE-2026-12243Source published Source updated
NLTK version 3.9.4 is vulnerable to a path traversal attack due to an incomplete fix for GitHub Issue #3504. The `_UNSAFE_NO_PROTOCOL_RE` regex in `nltk/data.py` checks for literal `../` sequences but fails to account for percent-encoded traversal sequences such as `..%2f`. The `url2pathname()` function decodes these sequences after the validation step, allowing an attacker to bypass the protection. This vulnerability enables an attacker to read arbitrary files accessible to the Python process by controlling the resource name parameter passed to `nltk.data.load()` or `nltk.data.find()`. The issue affects applications that rely on NLTK for resource loading, including NLP web applications, Jupyter notebooks, and CLI tools. The default `pathsec.ENFORCE=False` setting exacerbates the impact…
- Affected products in this advisory
- Red Hat OpenShift AI 2.25
- Red Hat OpenShift AI 3.4
- Exploit Intelligence
- Red Hat Ansible Automation Platform 2
1 more entries in the full advisory.
- Source-reported affected versions
- 3.9.4
- Source-reported fixed versions
- rhoai/odh-ta-lmes-job-rhel9:1787330903
- rhoai/odh-llama-stack-core-rhel9:1786635926
- rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9:1787073459
- rhoai/odh-trustyai-nemo-guardrails-server-rhel9:1787330585
2 more entries in the full advisory.
- Mitigation guidance
- Do not pass untrusted or user-controlled input directly to nltk.data.load() or nltk.data.find(). Validate and sanitize any resource name parameter before use, rejecting values containing percent-encoded characters (%2f, %2e) or path traversal sequences. As defense-in-depth, set nltk.pathsec.ENFORCE = True in application code to enable file-read restrictions at the open stage (disabled by default).
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