Detections
Analytics

SCA: security update for aws-encryption-sdk (GHSA-v638-38fc-rhfv)

medium Tenable Cloud Security Plugin ID 440814

Description

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

 - Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before
 version 3.3.1 and before version 4.0.5 might allow an authenticated local threat actor to bypass key
 commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to
 multiple different plaintexts. To remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or
 above. (CVE-2026-6550)

Solution

Update the aws-encryption-sdk library and its related packages to version 3.3.1 or later.

See Also

https://github.com/advisories/GHSA-v638-38fc-rhfv

Plugin Details

Severity: Medium

ID: 440814

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 4/24/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.23

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

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

CVSS Score Source: CVE-2026-6550

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

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

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

CVSS v4

Risk Factor: Medium

Base Score: 5.7

Threat Score: 1.9

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 4/24/2026

Vulnerability Publication Date: 4/20/2026

Reference Information

CVE: CVE-2026-6550

cwe: CWE-757