Detections
Analytics

Echo: nltk: security update to 3.10.3

high Tenable Cloud Security Plugin ID 464850

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 (ReDoS) vulnerability in the tgrep
 module. The _tgrep_node_action function compiles user-supplied regular expressions embedded in /regex/
 pattern nodes and executes them via re.search against tree node labels without any validation or timeout.
 An attacker who controls the tgrep pattern (e.g., via tgrep_positions() or tgrep_compile() exposed to
 external input) can supply a pattern that triggers catastrophic backtracking, causing indefinite CPU
 saturation that blocks the Python process. (CVE-2026-80206)

Solution

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

See Also

https://advisory.echohq.com/cve/CVE-2026-80206

Plugin Details

Severity: High

ID: 464850

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: Medium

Score: 5

Percentile: 93.48

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.2

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

CVSS Score Source: CVE-2026-80206

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 6.9

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:H/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: 8/26/2026

Reference Information

CVE: CVE-2026-80206