CVE-2026-19642

MEDIUM 5.9

Out-of-bounds write in the Base64 decoder in Amazon aws-sdk-cpp

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

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

CWE	CWE-787
Vendor	aws
Product	aws-sdk-cpp
Published	Aug 12, 2026
Last Updated	Aug 12, 2026

Stay Ahead of the Next One

Get instant alerts for aws aws-sdk-cpp

Be the first to know when new medium vulnerabilities affecting aws aws-sdk-cpp are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

AWS / aws-sdk-cpp

0 ≤ 1.11.861

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862 aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-080-aws/ github.com: https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-wxx3-prfc-69xx

Credits

University of Manchester