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CVE-2026-62388

Nltk insecure deserialization

7.5 HIGHPublic exploitEPSS 0.51%
  1. Published22 Aug 2026

Description

NLTK versions before 3.10.0 default to ENFORCE=False in pathsec.py, causing all security validation functions to emit warnings instead of raising exceptions. Attackers can bypass path traversal and pickle deserialization protections by exploiting the disabled security controls that are only active when manually enabled.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Nltk< 3.10.0

Remediation

Fixed in
Nltk≥ 3.10.0

References

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Frequently asked

Is CVE-2026-62388 being actively exploited?

CVE-2026-62388 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.51%.

How severe is CVE-2026-62388?

CVE-2026-62388 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.51% probability of exploitation.

Which products are affected by CVE-2026-62388?

Affected products include Nltk.

How do I fix CVE-2026-62388?

Upgrade affected software to a fixed version, for example Nltk 3.10.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.