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CVE-2026-0847

Path Traversal in nltk/nltk

8.6 HighPublic exploitFix available

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
Low
Availability
Low

Exploit likelihood

1.00%Up 0.8 points since Mar 5, 2026
90%50%10%1%

What each source reports

CVE List 7.5

Path Traversal in nltk/nltk

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
CVE-2026-0847
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness
CWE-22, CWE-22
Updated
2026-11-02
EUVDEUVD-2026-9475 7.5

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
EUVD-2026-9475
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-68j8-pq59-fqgm 8.6

NLTK has a Path Traversal issue

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
GHSA-68j8-pq59-fqgm
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness
CWE-22
Updated
2026-11-04
NVD 7.5

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
CVE-2026-0847
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness
CWE-22
Updated
2026-11-02
OSV 7.5

Path Traversal in nltk/nltk

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
CVE-2026-0847
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-22
Updated
2026-11-02
OSVDEBIAN-CVE-2026-0847 7.5

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
DEBIAN-CVE-2026-0847
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 5 moreShow less
OSVGHSA-68j8-pq59-fqgm 8.6

NLTK has a Path Traversal issue

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
GHSA-68j8-pq59-fqgm
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness
CWE-22
Updated
2026-11-04
OSVPYSEC-2026-98 7.5

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
PYSEC-2026-98
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-0847 7.5

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.

Record
UBUNTU-CVE-2026-0847
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.0
8.6 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Updated
2026-11-02
OSVMGASA-2026-0057 No score

Updated python-nltk packages fix security vulnerability

Path Traversal in nltk/nltk. (CVE-2026-0847)

Record
MGASA-2026-0057
Updated
2026-11-02
OSVopenSUSE-SU-2026:10304-1 No score

python311-nltk-3.9.3-1.1 on GA media

These are all security issues fixed in the python311-nltk-3.9.3-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10304-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nltk
PyPI
through 3.9.2
3.9.3
nltk
Debian:12
All versions, plus listed versions
3.10.0-13.10.1-13.10.3-13.8-13.8.1-1
Show 4 moreShow less
3.9.1-13.9.1-23.9.2-13.9.3-1
None known
nltk
Debian:13
All versions, plus listed versions
3.10.0-13.10.1-13.10.3-13.9.1-23.9.2-13.9.3-1
None known
nltk
Debian:14
before 3.9.3-1, plus listed versions
3.9.1-23.9.2-1
3.9.3-1
nltk
PyPI
before 3.9.3, plus listed versions
0.80.90.9.30.9.40.9.5
Show 45 moreShow less
0.9.60.9.70.9.80.9.92.0.12.0.1rc12.0.1rc2-git2.0.1rc32.0.1rc42.0.22.0.32.0.42.0.52.0b42.0b52.0b62.0b72.0b82.0b93.0.03.0.0b13.0.0b23.0.13.0.23.0.33.0.43.0.53.13.23.2.13.2.23.2.33.2.43.2.53.33.43.4.13.4.23.4.33.4.43.4.53.53.5b13.63.6.1
3.9.3
python-nltk
Mageia:9
before 3.9.3-1.mga9
3.9.3-1.mga9
nltk
Ubuntu:Pro:14.04:LTS
before 2.0~b9-0ubuntu4.1~esm6, plus listed versions
2.0~b9-0ubuntu42.0~b9-0ubuntu4.1~esm22.0~b9-0ubuntu4.1~esm42.0~b9-0ubuntu4.1~esm5
2.0~b9-0ubuntu4.1~esm6
nltk
Ubuntu:Pro:16.04:LTS
before 3.1-1ubuntu0.1+esm4, plus listed versions
3.0.4-13.0.5-13.1-13.1-1ubuntu0.13.1-1ubuntu0.1+esm13.1-1ubuntu0.1+esm23.1-1ubuntu0.1+esm3
3.1-1ubuntu0.1+esm4
nltk
Ubuntu:Pro:18.04:LTS
before 3.2.5-1ubuntu0.1+esm4, plus listed versions
3.2.4-13.2.5-13.2.5-1ubuntu0.13.2.5-1ubuntu0.1+esm13.2.5-1ubuntu0.1+esm23.2.5-1ubuntu0.1+esm3
3.2.5-1ubuntu0.1+esm4
nltk
Ubuntu:Pro:20.04:LTS
before 3.4.5-2ubuntu0.1~esm4, plus listed versions
3.4.5-13.4.5-23.4.5-2ubuntu0.1~esm13.4.5-2ubuntu0.1~esm23.4.5-2ubuntu0.1~esm3
3.4.5-2ubuntu0.1~esm4
Show 6 moreShow less
Affected packages
PackageAffectedFixed
nltk
Ubuntu:Pro:22.04:LTS
before 3.7-1ubuntu0.1~esm2, plus listed versions
3.5-13.6.5-13.6.7-13.7-13.7-1ubuntu0.1~esm1
3.7-1ubuntu0.1~esm2
nltk
Ubuntu:Pro:24.04:LTS
before 3.8.1-1ubuntu0.1~esm2, plus listed versions
3.8.1-13.8.1-1ubuntu0.1~esm1
3.8.1-1ubuntu0.1~esm2
nltk
Ubuntu:25.10
All versions, plus listed versions
3.9.1-2
None known
nltk
Ubuntu:26.10
All versions, plus listed versions
3.9.2-13.9.3-13.10.0-13.10.1-13.10.3-1
None known
nltk
Ubuntu:Pro:26.04:LTS
before 3.9.2-1ubuntu0.1~esm2, plus listed versions
3.9.1-23.9.1-2build13.9.2-13.9.2-1ubuntu0.1~esm1
3.9.2-1ubuntu0.1~esm2
python-nltk
openSUSE:Tumbleweed
before 3.9.3-1.1
3.9.3-1.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubHyperPS/CVE-2026-08472026-03-29

History

History
RecordedChangedSources
affected, referencesOSV
affected, factsGitHub Advisories
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-0847 is a high vulnerability (CVSS 8.6) in Nltk, published March 4, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.00%, the 63rd percentile. Fixed in nltk 3.9.3.

References

Show 16 moreShow less
This page doesn't list everything

Left out here: 13 versions. The JSON record has them.

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