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VulnerabilityPublished

CVE-2026-59974: stanfordnlp stanza · Path Traversal

Affects stanfordnlp stanzaSource CVE Database V5

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Not known to be exploited · CVSS 7.8 High : upgrade to 1.14.0 soon.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.14.0
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Upgrade stanfordnlp stanza to 1.14.0.

Affected software

ProductAffectedFixed in
stanfordnlpstanzaAffected
  • <1.14.0
Fixed in
  • 1.14.0
PyPIstanzapkg:pypi/stanzaOther threatsAffected
  • <1.14.0
Fixed in
  • 1.14.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade stanza to version 1.14.0 or later, where this path traversal vulnerability is fixed. Until then, avoid using stanza.download or stanza.install_corenlp with untrusted archives. There is no indication of alternative mitigations or temporary fixes.

Description

Stanza is a Stanford NLP Python library for tokenization, sentence segmentation, NER, and parsing of many human languages. Prior to 1.14.0, stanza.resources.common.unzip in stanza/resources/common.py passes downloaded model and resource archives to zipfile.ZipFile.extractall without validating member paths, and the vulnerable extraction path is reachable through stanza.download and stanza.install_corenlp. A malicious archive containing parent-directory traversal entries can write outside the intended model directory, allowing files writable by the Stanza process to be overwritten and potentially enabling code execution through modified shell configuration, SSH authorization data, Python packages, or executable scripts. This issue is fixed in version 1.14.0.

References

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