CVE-2026-19642

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.

CVSS 4.0

6.0CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

5.9CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-25)

CWE

CWE-787

Published

2026-08-12

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

Affected

• amazon:aws_software_development_kit

References

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

Check your stackJSON