OOB Write in aws-sdk-cpp Base64 Decoder before 1.11.862
CVE-2026-19642 Published on August 12, 2026
Out-of-bounds write in the Base64 decoder in Amazon aws-sdk-cpp
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.
Vulnerability Analysis
CVE-2026-19642 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and a high impact on availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-19642 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-19642
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Affected Versions
aws-sdk-cpp:- Before and including 1.11.861 is affected.