High [CVE-2026-63312] Arbitrary file read via StreamBackedCorpusView bypass
This high-severity Red Hat Linux advisory covers CVE-2026-63312 affecting Lightspeed Core, Red Hat Ansible Automation Platform 2.
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Summary
NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open() directly instead of pathsec.open(). Attackers who control the fileid argument can read arbitrary local files regardless of the ENFORCE setting, including sensitive system files and application credentials.
A flaw was found in NLTK. This vulnerability, specifically within the `StreamBackedCorpusView` component, allows an attacker to bypass security enforcement by directly calling `builtins.open()` instead of the intended `pathsec.open()`.
The flaw in `StreamBackedCorpusView` bypasses intended security controls, enabling an attacker who can manipulate the `fileid` argument to access sensitive system files and application credentials within affected Red Hat products such as OpenShift Lightspeed, Lightspeed Core, and Red Hat Ansible Automation Platform.
This could lead to significant information disclosure. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-22. Red Hat lists Exploit Intelligence; OpenShift Lightspeed; Red Hat OpenShift AI (RHOAI) as not affected.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat Ansible Automation Platform 2.
- < 3.10.0
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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