CVE-2026-19643

MEDIUM 5.3

Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-125
Vendor	aws
Product	aws-sdk-cpp
Published	Aug 12, 2026
Last Updated	Aug 12, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

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-mxm9-xpf9-x66x

Credits

University of Manchester