CVE-2026-19643

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

State: Published
Severity: 6.0 Medium
Published: Aug 12, 2026
Updated: Aug 13, 2026
Reserved: Aug 12, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	AMZN
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	AMZN

Weaknesses

CWE-125 Out-of-bounds read

Affected Products

Product	Versions
aws-sdk-cppAWS	1.11.861 and earlierAffected

References

https://github.com/aws/aws-sdk-cpp/releases/tag/1.11.862release-notespatch
https://aws.amazon.com/security/security-bulletins/2026-080-aws/vendor-advisory
https://github.com/aws/aws-sdk-cpp/security/advisories/GHSA-mxm9-xpf9-x66xrelease-notes

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