CVE-2026-0847High· 7.5▾ MidnightPoC availableA flaw was found in NLTK (Natural Language Toolkit). This vulnerability allows a remote attacker to read arbitrary files on the server due to improper sanitization of file paths in several CorpusReader classes, including WordListCorpusRead…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 41.3 · likelihood 0.2 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the vendor's CSAF advisory record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.9%
8.6 → 7.5
Last analysed / modified upstream
0.9% → 0.9%
1 GitHub repo (last check)
A flaw was found in NLTK (Natural Language Toolkit). This vulnerability allows a remote attacker to read arbitrary files on the server due to improper sanitization of file paths in several CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. By exploiting this path traversal vulnerability, an attacker can gain unauthorized access to sensitive information, such as system files, SSH private keys, and API tokens. In certain scenarios, this could potentially lead to remote code execution.
nltk: NLTK: Arbitrary file read via path traversal vulnerability — rated Important by Red Hat. Released 2026-03-04, updated 2026-10-15.
Affected:
Fixed:
No fix planned:
Not affected:
For Red Hat OpenShift AI 2.25.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update:
https://docs.redhat.com/en/documentation/red_hat_openshift_ai/ https://access.redhat.com/errata/RHSA-2026:10184 For Red Hat OpenShift AI 3.3.3 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update:
https://docs.redhat.com/en/documentation/red_hat_openshift_ai/ https://access.redhat.com/errata/RHSA-2026:19712
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-0846High· 7.5nltk: NLTK: Arbitrary file read via improper path validation in `filestring()` function (CVE-2026-0846)
CVE-2026-55607High· 7.1Claude Code: @anthropic-ai/claude-code: Claude Code: Arbitrary code execution through git directory confusion (CVE-2026-55607)
CVE-2026-27888Medium· 5.3pypdf: pypdf: Denial of Service via crafted PDF (CVE-2026-27888)
CVE-2026-55888High· 8.2xdg-desktop-portal: xdg-desktop-portal: Unauthorized host file access via unvalidated FileChooser filenames (CVE-2026-55888)
CVE-2026-115354Medium· 6.5mistune: mistune: Information disclosure via path traversal in Include directive (CVE-2026-115354)
CVE-2026-114140High· 7.8nbconvert: nbconvert: arbitrary file write via path traversal in ExtractOutputPreprocessor (CVE-2026-114140)