Detections
Analytics

Echo: nltk: security update to 3.10.3

medium Tenable Cloud Security Plugin ID 459867

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader
 that allows unauthenticated attackers to cause a denial of service by supplying deeply nested feature-
 structure input. Attackers can craft trivial payloads with nested brackets that exceed Python's recursion
 limit and raise an unhandled RecursionError, crashing applications that parse user-supplied feature
 structures or feature grammars. (CVE-2026-81724)

Solution

Update the nltk library and its related packages to version 3.10.3 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-81724

Plugin Details

Severity: Medium

ID: 459867

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-81724

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 5.5

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/3/2026

Vulnerability Publication Date: 8/27/2026

Reference Information

CVE: CVE-2026-81724