CVE-2026-19642 Out-of-bounds write in the Base64 decoder in Amazon aws-sdk-cpp
A remote authenticated user can trigger heap memory corruption or crashes in applications using the AWS C++ SDK via crafted Base64 input.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-19642?
CVE-2026-19642 is a medium-severity memory corruption vulnerability in aws-sdk-cpp, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-19642?
It affects 1 product.
Products include Amazon Aws Software Development Kit.
How do I fix CVE-2026-19642?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-19642 being exploited?
There is no known exploitation of CVE-2026-19642 in the wild and no public exploit code.
Other vulnerabilities in aws-sdk-cpp
- CVE-2018-19981 Information disclosure in n/a
- CVE-2026-19643 Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms
- CVE-2023-51651 Potential URI resolution path traversal in the AWS SDK for PHP
- CVE-2022-4725 AWS SDK XML Parser XpathUtils.java XpathUtils server-side request forgery
- CVE-2022-2582 Exposure of unencrypted plaintext hash in github.com/aws/aws-sdk-go
Sources
Also known as GHSA-wxx3-prfc-69xx.