Detections
Analytics

Echo: nltk: security update to 3.10.1

high Tenable Self-Hosted Container Security Plugin ID 457376

Description

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

 - The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORD_RE and applied
 by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix
 [a-z0-9]+(?:[.\-][a-z0-9]+)* is unbounded. Input consisting of many alternating label separators can be
 partitioned in exponentially many ways, and because the branch also requires a trailing top-level domain
 that such input never supplies, the engine explores those partitions before failing at each offset. A few
 kilobytes of input therefore consumes seconds to minutes of single-threaded CPU, and the HANG_RE
 substitution performed before matching does not collapse the pattern. TweetTokenizer is intended for
 tokenizing untrusted social-media text, so any service that applies it, or the module-level
 casual_tokenize, to submitted text can be stalled per request without authentication. Version 3.10.1
 bounds the label repetition. (CVE-2026-72818)

Solution

Update the nltk library and its related packages to version 3.10.1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-72818

Plugin Details

Severity: High

ID: 457376

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.63

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-72818

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/3/2026

Vulnerability Publication Date: 8/20/2026

Reference Information

CVE: CVE-2026-72818