CVE-2026-19643— Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms
Quick assessment
Affected
AWS aws-sdk-cpp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Amazon AWS SDK for C++是美国Amazon公司的一款支持C++语言访问云服务的软件开发工具包。 Amazon AWS SDK for C++ 1.11.862之前版本存在缓冲区错误漏洞，该漏洞源于Base64解码器存在越界读取问题，可能导致远程认证用户使处理特制Base64编码输入的应用程序崩溃。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | aws-sdk-cpp | ≤ 1.11.861 |
affected |
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I. Basic Information for CVE-2026-19643
Vulnerability Information
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Vulnerability Title
Out-of-bounds read in the Base64 decoder in Amazon aws-sdk-cpp on signed-char platforms
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Amazon AWS SDK for C++ 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Amazon AWS SDK for C++是美国Amazon公司的一款支持C++语言访问云服务的软件开发工具包。 Amazon AWS SDK for C++ 1.11.862之前版本存在缓冲区错误漏洞，该漏洞源于Base64解码器存在越界读取问题，可能导致远程认证用户使处理特制Base64编码输入的应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| AWS | aws-sdk-cpp | 0 ~ 1.11.861 | - |
|
II. Public POCs for CVE-2026-19643
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-19643 (2)
Vendor Pages for CVE-2026-19643 (1)
Same Patch Batch · AWS · 2026-08-12 · 4 CVEs total
| CVE-2026-18952 | 8.1 HIGH | Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plug |
| CVE-2026-19311 | 8.1 HIGH | Missing Authorization in Execute Monitor API in OpenSearch Alerting Plugin |
| CVE-2026-19642 | 5.9 MEDIUM | Out-of-bounds write in the Base64 decoder in Amazon aws-sdk-cpp |
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