Detections
Analytics

Echo: nltk: security update to 3.10.0

medium Tenable Self-Hosted Container Security Plugin ID 461616

Description

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

 - NLTK before 3.10.0 (affected versions <= 3.9.4) contains a server-side request forgery (SSRF)
 vulnerability in the validate_network_url() function in nltk/pathsec.py. The _resolve_hostname() helper
 catches OSError and ValueError during socket.getaddrinfo() and returns an empty list; when DNS resolution
 fails, the validation loop executes no IP checks and the function fails open, allowing urlopen() to
 proceed without validation. An attacker who can trigger DNS resolution failures or use DNS rebinding can
 bypass SSRF protections and reach restricted network resources, including cloud metadata endpoints (e.g.,
 169.254.169.254). (CVE-2026-63311)

Solution

Update the nltk library and its related packages to version 3.10.0 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-63311

Plugin Details

Severity: Medium

ID: 461616

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: 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:P/A:N

CVSS Score Source: CVE-2026-63311

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:L/A:N

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:L/VA:N/SC:L/SI:L/SA:L

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/3/2026

Vulnerability Publication Date: 8/22/2026

Reference Information

CVE: CVE-2026-63311