ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-0848

NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module.

Published Mar 5, 2026 · catalog updated Jun 17, 2026 · NLTK versions <=3.9.2 are

Check if you run it

No confirmed exploitation is on record for CVE-2026-0848. EPSS is 0.77%. Act only if a listed version of NLTK versions <=3.9.2 are is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (NLTK versions <=3.9.2 are).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical10.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.77%
Remediation
Version ranges on file
Affected products
cpe nltk/nltk · stated nltk

NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamically loads external Java .jar files without verification or sandboxing. An attacker can supply or replace the JAR file, enabling the execution of arbitrary Java bytecode at import time. This vulnerability can be exploited through methods such as model poisoning, MITM attacks, or dependency poisoning, leading to remote code execution. The issue arises from the direct execution of the JAR file via subprocess with unvalidated classpath input, allowing malicious classes to execute when loaded by the JVM.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe nltk/nltkversion unspecified
  • stated nltk<= 3.9.2

How to fix CVE-2026-0848

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-0848. EPSS is 0.77%. Act only if a listed version of NLTK versions <=3.9.2 are is installed.

Which versions are affected?

Compare what you have installed with <= 3.9.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 0.77%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 5, 2026 · NIST NVD

    Detected

    NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamically loads external Java .jar files without verification or sandboxing. An attacker can supply or replace the JAR file, enabling the execution of arbitrary Java bytecode at import time. This vulnerability can be exploited through methods such as model

  2. Jun 17, 2026 · NIST NVD

    Updated

    NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamically loads external Java .jar files without verification or sandboxing. An attacker can supply or replace the JAR file, enabling the execution of arbitrary Java bytecode at import time. This vulnerability can be exploited through methods such as model

Sources

  • CVE.orgVulnerability recordCVE-2026-0848

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-0848

    30-day exploitation probability 0.8%

    first.org
  • NIST NVDVulnerability recordCVE-2026-0848

    NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamically loads external Java .jar files without verification or sandboxing. An attacker can supply or replace the JAR file, enabling th

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.