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SCA: security update for idna (GHSA-65pc-fj4g-8rjx)

medium Tenable Cloud Security Plugin ID 442175

Description

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

 - Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized
 Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15,
 payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior
 to length rejection, and for high values of `N` will take a long time to process. This is the same issue
 as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted
 argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-
 of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any
 further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser
 used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain
 names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain
 to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by
 arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming
 there is no preliminary input validation by the higher-level application. (CVE-2026-45409)

Solution

Update the idna library and its related packages to version 3.15 or later.

See Also

https://github.com/advisories/GHSA-65pc-fj4g-8rjx

Plugin Details

Severity: Medium

ID: 442175

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 5/19/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-45409

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 2.7

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/19/2026

Vulnerability Publication Date: 5/19/2026

Reference Information

CVE: CVE-2026-45409