Detections
Analytics

Echo: nltk: security update to 3.10.3

medium Tenable Cloud Security Plugin ID 460880

Description

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

 - NLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader
 that allows attackers to cause quadratic CPU consumption by supplying malformed TEI blocks with many
 unmatched opening tags. Attackers can exploit lazy regex patterns in the read_block method through public
 APIs like words() and tagged_words() to force repeated rescans and achieve near-quadratic runtime growth.
 (CVE-2026-81725)

Solution

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

See Also

https://advisory.echohq.com/cve/CVE-2026-81725

Plugin Details

Severity: Medium

ID: 460880

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: 3.9

Percentile: 52.48

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 2

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

CVSS Score Source: CVE-2026-81725

CVSS v3

Risk Factor: Low

Base Score: 3.7

Temporal Score: 3.4

Vector: CVSS:3.0/AV:N/AC:H/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: 6.3

Threat Score: 2.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:H/AT:P/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: 9/10/2026

Vulnerability Publication Date: 8/27/2026

Reference Information

CVE: CVE-2026-81725