CVE-2026-19643

Medium

Description

An out-of-bounds read issue in the Base64 decoder in Amazon aws-sdk-cpp before 1.11.862, on some platforms, might allow a remote authenticated user to crash an application that processes crafted Base64-encoded input. To remediate this issue, users should upgrade to version 1.11.862.

SeverityMedium

CVSS5.3

Exploit probability—

ProductAmazon Aws Software Development Kit

PublishedAug 12, 2026

First seenAug 12, 2026

Weakness typeCWE-125Out-of-bounds read

How to fix

Update

amazon aws_software_development_kit1.11.862 or later

Patches

github.com/aws/aws-sdk-cpp/releases/tag/1.11.862

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-080-aws/
github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66x

Affected products

Product	Affected versions	Fixed in
amazon aws_software_development_kit	v < 1.11.862	1.11.862

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